JPS6011630Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in electrolytic capacitors used in audio equipment and the like.

In recent years, electronic components such as capacitors used in audio systems have been designed with a focus on electrical characteristics.However, with the development of audio technology, not only electrical characteristics but also sound quality in audio systems have been designed. It is well known that evaluation is also becoming more important.

Especially when it comes to electrolytic capacitors, the sound quality of audio equipment is greatly affected by differences in components, structure, etc.
It is an electronic component with a lot of room for improvement.

In the conventional electrolytic capacitor, as shown in FIGS. 1, 2, and 3, external lead terminals 3 are connected to anode foil 1 and anode foil 2 by crimping or the like, and then electrolytic paper 4 is connected to the anode foil 1 and anode foil 2. The capacitor element 5 is formed by winding the capacitor element 5 through the capacitor.

Next, the element 5 was impregnated with an electrolytic solution, a sealing member 6 made of rubber or the like was attached, and the element 5 was inserted into a case 7 made of aluminum or the like, and the opening of the case 7 was sealed.

When a high frequency current is passed through such an electrolytic capacitor,
In general, when the case is made of metal such as aluminum, although it is not a magnetic metal, it has been found that an extremely small loop current is generated at the bottom of the cylindrical metal capacitor case due to the magnetic flux caused by winding the aluminum electrode of the capacitor element.

However, when it comes to sound quality in audio technology, it is well known that loop current is a major cause of sound quality distortion.In order to eliminate this loop current, the bottom of the cylindrical metal capacitor case was removed and a cylindrical metal pipe was used to replace the bottom. Structures formed from rubber baking, resin, etc., and resin cases instead of metal cases are being used, but at present they are faced with many obstacles, such as increased man-hours and the inability to reuse existing equipment.

The present invention has been devised to eliminate the above-mentioned drawbacks, and provides an electrolytic capacitor whose loop current can be easily reduced or eliminated without significantly changing existing equipment or working methods.

In other words, it is known that when graphite is ground, carbon-carbon bonds are broken, causing a large change in magnetic susceptibility and inducing paramagnetism. Taking advantage of the property that heat treatment at 700°C causes a large difference in magnetic receptivity, we focused on the characteristics of carbon and the fact that carbon has high conductivity compared to other non-metals, and we have developed a conventional resin case. After impregnating the capacitor element of the housed electrolytic capacitor with the paste, applying the rated voltage to the electrodes of the element and measuring the potential difference between the top lead-out side and the bottom side of the element, it was found that at the outer periphery. The potential on the bottom side is high <, (and several meters, V ~ several 107 FLY
The present invention will be described below with reference to an embodiment shown in FIGS. 4 and 5. FIGS. 4 and 5 show the aluminum anode electrode foil 11 and the cathode electrode facing each other. A separator 1 such as electrolytic paper is placed between the foil 12
3 and carbon nonwoven fabric-containing paper 14 are interposed between the capacitor elements. FIG. 4 is a cross-sectional view of the main part, and FIG. 5 is a partially exploded perspective view. A carbon nonwoven fabric-containing paper 14 is interposed between an anode electrode foil 11 and a cathode electrode foil 12 which are connected to each other by a method, and a separator 1 is further interposed between the carbon nonwoven fabric containing paper 14 and the anode electrode foil 11.
A capacitor element 15 is formed by winding the capacitor element 15 through the
This is an electrolytic capacitor in which the capacitor element 15 is impregnated with an electrolytic solution and housed in a case.

Note that the same effect can be obtained by using a carbon nonwoven fabric instead of the carbon nonwoven fabric-containing paper interposed between the opposing electrode foils in the above description.

Further, in the embodiments, a wound structure was described, but a stacked structure may be used, and the separator may be interposed not only between the carbon nonwoven fabric and the anode electrode foil, but also between the carbon nonwoven fabric and the cathode electrode foil.

Further, the length or width of the carbon nonwoven fabric-containing paper or the carbon nonwoven fabric may be approximately the same as the electrode foil, or may be partially interposed.

Furthermore, the effect can be sufficiently obtained even if the width is wide or narrow, and the key is to interpose a carbon nonwoven fabric between the electrode foils and a separator such as electrolytic paper between the carbon nonwoven fabric and the anode electrode foil. .

By configuring the present invention as described above, the magnetic flux generated from the capacitor element perpendicular to the bottom surface of the capacitor case is prevented by the carbon nonwoven fabric interposed between the electrode foils of the capacitor element, and does not permeate vertically. Its path is then bent, and the loop current generated at the bottom of the metal case is reduced or eliminated.

This seems to be due to the carbon nonwoven fabric acting as an electrostatic shield, and even when a resin case is used, the electrical potential difference on the element surface is reduced or eliminated due to the conductive carbon nonwoven fabric.

In addition, if fine carbon powder is simply dispersed between electrode foils,
When capacitors are used in audio equipment circuits, carbon powder moves in the electrolyte due to internal electrical vibrations such as resonance reduction, or external mechanical vibrations, which adversely affects sound quality. It is made into a sheet and does not separate and move in the electrolyte, providing sound quality with extremely low distortion.

Furthermore, the distortion rate characteristics of the electrolytic capacitor of the present invention (rated at 50 WV, 100 OA μF) formed as described above and the conventional electrolytic capacitor (rated at 50 WV, 100 OA μF) are shown in Fig. 6, where A is the product of the present invention, and This is a conventional product.

As is clear from the figure, the electrolytic capacitor of the present invention in which a carbon nonwoven fabric is interposed between opposing electrode foils is 30KH2
It can be seen that the distortion rate is significantly improved, and there is a remarkable effect.

In addition, when the electrolytic capacitor of this invention was installed in the power supply circuit of an audio system and listened to, it was proven that the three-dimensional effect was improved and the sound quality was superior compared to conventional electrolytic capacitors. .

As described above, the electrolytic capacitor of the present invention has a carbon nonwoven fabric interposed between opposing electrode foils, and a capacitor element is formed by interposing a separator such as electrolytic paper between at least the anode electrode foil and the carbon nonwoven fabric. Because of this, there is no short circuit between the electrode foils, and the sound quality is such that there is no distortion in the sound range, the bass sounds are suppressed, and the distortion rate characteristics in the high frequency range are greatly improved, and the third harmonic is reduced. When used in audio systems, various audio transmission systems, etc., it produces a remarkable effect of high fidelity.

[Brief explanation of drawings]

Figures 1, 2, and 3 show conventional electrolytic capacitor elements, with Figure 1 being a partially exploded perspective view, Figure 2 being a sectional view of the main parts, and Figure 3 being an electrolytic capacitor housing the capacitor element. 4 and 5 show an embodiment of the capacitor element of the electrolytic capacitor of the present invention, FIG. 4 is a sectional view of the main part, FIG. 5 is a partially exploded perspective view, and FIG. In the distortion rate characteristic diagram of the capacitor, A is the invented product and A is the conventional product. 11... Anode electrode foil, 12... Cathode electrode foil, 13... Separator, 14...
Carbon nonwoven fabric-containing paper, 15...Capacitor element,
16... Output terminal.

Claims (1)

[Scope of utility model registration request] An electrolytic capacitor formed by winding or laminating a carbon nonwoven fabric between opposing electrode foils, and further interposing a separator such as electrolytic paper between at least the carbon nonwoven fabric and an anode electrode foil.