JP2000100664A - Acoustic electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic electrolytic capacitor for reproducing high- quality musical signals. SOLUTION: In an acoustic electrolytic capacitor which is manufactured by winding anode foil 4 and cathode foil 5 in a state where the foil 4 and 5 are alternately arranged between two pieces of electrolytic paper 2 and 3 having different equivalent series resistance values (ESR values) and impregnating the paper 2 and 3 with an electrolytic solution for driving, the ratio between the ESR values of the paper 2 and 2 is adjusted to >=4.3, preferably, to 4.3-38.4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor, and more particularly to an acoustic electrolytic capacitor.

[0002]

2. Description of the Related Art Generally, an aluminum electrolytic capacitor is
An anode foil and a cathode foil are alternately arranged and wound between a first electrolytic paper (separator) and a second electrolytic paper, and a capacitor element impregnated with a driving electrolyte is provided with a bottomed material made of aluminum or the like. And the opening is sealed with a sealing member made of a rubber material or the like, and a lead connected to the anode foil and the cathode foil is drawn out through the sealing member.

[0003] Paper made of vegetable fibers such as kraft or manila hemp is generally used as electrolytic paper. Depending on the papermaking format, electrolytic paper may be, for example, single-mesh paper (paper made of a single layer made using a circular net) or double-meshed paper (paper made of two layers made of the same or different raw materials made using a circular net). And various thicknesses such as 30 μm to 130 μm. In a general aluminum electrolytic capacitor, the same material, density, and thickness are used for the first electrolytic paper and the second electrolytic paper separating the anode foil and the cathode foil.

[0004]

However, in order to reduce the size and the loss of the electrolytic capacitor and to reduce the short circuit failure, at least one of the density and the thickness of one of the first and second electrolytic papers is required. One of the first, second, and third electrolytic papers may have one of the following thicknesses, densities, and material configurations to improve the sound quality by increasing the density of the other electrolytic paper (see Japanese Utility Model Publication No. 55-149939). There has been proposed a filter in which the difference is larger than that of the other electrolytic paper (Japanese Utility Model Laid-Open No. 56-26944).

Further, in order to prevent a short puncture (short circuit) at a mounting position due to caulking of a lead wire with an anode foil or a cathode foil due to a decrease in strength caused by a decrease in the density or thickness of the electrolytic paper. A high-density or thick electrolytic paper may be placed on the ladder board side of the lead lead attached to the anode foil, and a low-density or thin electrolytic paper may be placed on the caulking connection side. Has been proposed (U.S. Utility Model Registration Publication No. 2559920,
No. 559921).

However, the conventional electrolytic capacitors have not been satisfactory as electrolytic capacitors for acoustics.
SUMMARY OF THE INVENTION The present invention provides a sound electrolytic capacitor for reproducing high quality music signals.

[0007]

According to the present invention, an anode foil and a cathode foil are alternately arranged between first electrolytic paper and second electrolytic paper having different equivalent series resistance values (hereinafter referred to as "ESR values"). The equivalent series resistance of the first electrolytic paper and the second electrolytic paper in an acoustic electrolytic capacitor in which a capacitor element impregnated with a winding and impregnated with a driving electrolytic solution is housed in a case and sealed with a sealing body. The value ratio is set to 4.3 or more.

[0008] Further, a capacitor element formed by alternately arranging anode foils and cathode foils between first electrolytic paper and second electrolytic paper having different equivalent series resistance values, winding the impregnated electrolytic solution, and impregnating with a driving electrolytic solution is used as a case. In the acoustic electrolytic capacitor which is housed inside and sealed with a sealing body, the ratio of the equivalent series resistance value of the first electrolytic paper and the second electrolytic paper is set in a range of 4.3 to 38.4. Features.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an aluminum electrolytic capacitor for acoustics 1 has a capacitor element 6 wound by arranging an anode foil 4 and a cathode foil 5 between electrolytic papers 2 and 3.
After being impregnated with the driving electrolyte, it is housed in a bottomed case 7 made of aluminum, and the extraction leads 8 and 9 connected to the anode foil 4 and the cathode foil 5 are inserted into the through-holes of the sealing body 11 made of rubber. 12 and pulled out to the outside.
Thus, the opening 10 of the case 7 is sealed.

[0010] Etched aluminum foil is used for the anode foil 4 and the cathode foil 5, and an anodic oxide film is formed on the surface of the anode foil 4.

As the driving electrolyte, for example, an electrolyte containing ethylene glycol as a main solvent and adipic acid as a main solute, and in addition, a solution containing γ-butyrolactone as a main solvent are used.

As the electrolytic paper, for example, paper mainly made of kraft (referred to as “kraft paper”) or paper mainly composed of manila hemp (referred to as “manila paper”) is used. Manila paper or a combination of manila paper and manila paper is used, but other papers and combinations may be used.

The ESR value of the electrolytic paper varies depending on the driving electrolyte used. When an ethylene glycol-based driving electrolyte is used (20 ° C.) as the driving electrolyte, the kraft paper has an ESR value of 0.6 to 6. About 1Ω, 0.3 for Manila paper
It is about 1.8 Ω.

In the acoustic electrolytic capacitor of the present invention, the ratio between the ESR values of the first electrolytic paper and the second electrolytic paper used is as follows:
When measured using an ethylene glycol-based driving electrolyte, the value is adjusted to 4.3 or more, and preferably from 4.3 to
It should be in the range of 38.4. ESR value ratio of 4.3
If it is less than 3, high quality sound quality cannot be reproduced.
If it exceeds 8.4, no further improvement in sound quality can be seen, so that it is not effective.

For example, when manila paper (A) having an ESR value of 1.72 Ω and manila paper (B) having an ESR value of 0.40 Ω are used, the ratio A / B of the ESR values of both electrolytic papers is 4. It becomes 3.

The order of arrangement of the first electrolytic paper and the second electrolytic paper having different ESR values from the anode foil and the cathode foil is arbitrary. Also, a plurality of electrolytic papers may be used for one or both electrolytic papers.

[0017]

EXAMPLE An aluminum foil having a thickness of 80 .mu.m was used as an anode foil and an aluminum foil having a thickness of 50 .mu.m was used as a cathode foil, and two sheets of electrolytic paper (made by Nippon Advanced Paper Industries Co., Ltd.) shown in Table 1 were used. A and B) are impregnated with a driving electrolytic solution containing ethylene glycol as a main solvent and adipic acid as a main solute in a capacitor element which is alternately arranged and wound between A and B). Are sealed with a rubber sealing member, and the aluminum electrolytic capacitors (diameter 18) of Examples 1 to 8 and Comparative Examples 1 to 10 of
mm, height 35.5 mm, 63V 1000 μF).

[0018]

[Table 1]

In Table 1, ME means single-mesh net paper mainly made of Manila hemp, and MER means single-mesh net paper mainly made of Manila hemp and esparto. ME and M
0.5, 1, 2, 2.5, and 3 after ER indicate a difference in density, and 30 to 60 after that means thickness. PEDH
And PED mean a double paper consisting of two layers mainly composed of kraft, and the following 30 to 130 mean the thickness. Further, SW5D4W means that it is a circular double-sheet paper which is a mixture of special manila hemp and hemp. Further, 27 of the subsequent 2750 indicates the density, and 50 indicates the thickness.

The measurement of the ESR value is performed by using an electrolytic paper having a diameter of 38 mm.
After impregnating the sample punched into a disk shape with an electrolyte solution for driving ethylene glycol and leaving it to stand for 30 minutes or more, after adjusting the distance between the electrodes to 1.5 times the sample thickness between the electrodes. , 20 ° C. and 1 KHz four times, and the average value was taken as the ESR value.

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

[Table 4]

The comparative examples 1 to 10 and the examples 1 to
Using the aluminum electrolytic capacitor of No. 8 as a capacitor for smoothing the power supply of audio equipment, the music playback sound was sampled by six persons, and the sound quality was evaluated on a scale of 10 out of 10 points divided into the band, texture, resolution, sound image and sound field. did. Table 5 shows the results.
To Table 7 below.

In Tables 5 to 7, the band is a frequency characteristic and means that the frequency band of a sound in which a high score can be reproduced is wide. The texture is the S / N ratio of the sound and means the reproducibility of the sound elongation. Further, the resolution is the resolution of the sound, and means, for example, the degree to which the overlapping melody can be grasped. The sound image is the beauty of the sound, meaning the sense of transparency and contour of the sound, and the sound field means the thickness of the sound, that is, the convergence of the sound.

[0026]

[Table 5]

[0027]

[Table 6]

[0028]

[Table 7]

From the results of Tables 5 to 7, the acoustic aluminum electrolytic capacitors of Examples 1 to 8 of the present invention have a ratio of the ESR value of the first electrolytic paper to that of the second electrolytic paper of less than 4.3. It can be seen that the sound quality is superior to the aluminum electrolytic capacitors of Comparative Examples 1 to 10.

[0030]

According to the acoustic electrolytic capacitor of the present invention, high quality sound quality can be reproduced.

[Brief description of the drawings]

FIG. 1 is an exploded cutaway view showing an acoustic electrolytic capacitor of the present invention.

[Description of Signs] 1 Aluminum electrolytic capacitor for sound 2 Electrolytic paper 3 Electrolytic paper 4 Anode foil 5 Cathode foil 6 Capacitor element 7 Case 8 Leader lead 9 Leader lead 10 Opening 11 Sealing body 12 Through hole

Claims (2)

[Claims] 1. A capacitor element comprising an anode foil and a cathode foil alternately arranged and wound between a first electrolytic paper and a second electrolytic paper having different equivalent series resistance values and impregnated with a driving electrolyte. An acoustic electrolytic capacitor housed in a case and sealed with a sealing body, wherein the ratio of the equivalent series resistance of the first electrolytic paper to the second electrolytic paper is 4.3 or more. For electrolytic capacitors. 2. A capacitor element comprising an anode foil and a cathode foil alternately arranged and wound between a first electrolytic paper and a second electrolytic paper having different equivalent series resistance values and impregnated with a driving electrolyte. In the acoustic electrolytic capacitor housed in a case and sealed with a sealing body, the ratio of the equivalent series resistance of the first electrolytic paper to the second electrolytic paper is in the range of 4.3 to 38.4. An electrolytic capacitor for sound characterized by the following.