JPH09232193A - Electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sound quality by preventing vibration of rubber laminated resin board of audio electrolytic capacitor. SOLUTION: A capacitor element 1 is made by winding or anode foil and a cathode foil made of aluminum foil via a separator is impregnated with electrolytic solution. An electrolytic capacitor is made of the capacitor element 1 housed in a metallic case and sealed with an opening sealing board. The opening sealing board is a resin board 7 with rubber 6 on the top and/or on the underside of which silk fiber fabric 9 is placed. The main polymer of the material of rubber 6 forming the opening sealing board is ethylene propylene terpolymer(EPT) or styrene-butadiene rubber(SBR).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound quality electrolytic capacitor having an improved rubber-coated resin plate.

[0002]

2. Description of the Related Art In an electrolytic capacitor, a capacitor element formed by winding an anode foil and a cathode foil made of aluminum foil through a separator paper is impregnated with an electrolytic solution, and the capacitor element is housed in a metal case. It is formed by sealing with a rubber-coated resin plate. Conventionally, the rubber material of the rubber-bonded resin plate of the electrolytic capacitor for sound quality is natural rubber (N
R), styrene butadiene rubber (SBR), ethylene propylene terpolymer (EPT), isobutylene isoprene rubber (IIR), etc.
Although it is used by being attached to a resin plate, it is difficult to make a breakthrough improvement in sound quality because the thickness and hardness of both materials are only changed.

[0003]

The rubber-bonded resin plate of the electrolytic capacitor for sound quality is constantly tuned by the strength and weakness of the signal current flowing through the electrodes, the magnitude of the frequency, and the sound pressure emitted from the speaker and the vibration of the set substrate caused by the sound pressure. There is a slight change in vibration, and the change in vibration changes the intermolecular distance between the rubber and the resin that make up the rubber-coated resin plate, resulting in an imbalance in the dumping force of the rubber-coated resin plate, resulting in a secondary Vibration is applied to the signal current, and the energy balance of the timbre is disturbed, resulting in sound quality deterioration and sound quality distortion. Most of the rubber-coated resin plates of conventional sound quality capacitors are ethylene / propylene / terpolymer (EPT).
Alternatively, styrene-butadiene rubber (SBR) is used, and the focus was on improving the airtightness to suppress the dry-up of the electrolyte and to improve the reliability, so the material thickness for improving the sound quality. It was just changing the hardness. Therefore, even if other constituent materials and structures are dramatically improved, it is difficult to realize optimum sound quality because the sound quality level of the sealing plate is low.

[0004]

Means for Solving the Problems The present invention is to solve the above problems by impregnating an electrolytic solution into a capacitor element in which an anode foil and a cathode foil made of an aluminum foil are wound around a separator, Store the capacitor element in a metal case,
An electrolytic capacitor sealed by a sealing plate, wherein the sealing plate is a rubber-bonded resin plate, and a silk fiber cloth is arranged on the upper surface and / or the lower surface of the resin plate, which are bonded together to form the sealing plate. An ethylene-propylene-terpolymer (EPT) or styrene-butadiene-rubber (SBR) is used as the main polymer of the rubber material. By using a silk fiber cloth on the surface of the rubber-coated resin plate, the flexibility of the silk fiber and the strength of the cloth suppress the vibration of the rubber-coated resin plate due to sound pressure, resulting in deterioration of sound quality due to the rubber-coated resin plate. , It is possible to suppress the sound quality distortion.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A sealing plate obtained by arranging silk fiber cloth, which is animal fiber and has a small fiber diameter and twisted in a thread shape, on the upper surface and / or the lower surface of a rubber-coated resin plate. To prepare an electrolytic capacitor. The silk fiber cloth suppresses internal vibration and deformation of the rubber-coated resin plate due to sound pressure, and makes the vibration uniform.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. Figure 1 shows that ethylene-propylene terpolymer (EPT) is used as the main polymer that forms rubber, and the resin plate to which this is laminated is a phenol plate. FIG. 3 is a cross-sectional view of a sound quality electrolytic capacitor using the rubber-coated phenolic plate of the present invention in which a silk fiber cloth is arranged and molded. FIG. 2 is a cross-sectional view of a sealing plate formed by arranging a silk fiber cloth on the lower surface of the rubber-coated phenolic plate with a polypropylene sheet sandwiched therebetween and molding. Figure 3 shows the materials ethylene, propylene,
FIG. 4 is a perspective view of a conventional rubber-coated phenolic plate using a terpolymer (EPT), and FIG. 4 is a sectional view of the conventional sealing plate.

Table 1 shows the results of comparative evaluation of the sound quality of the 50 WV 10000 μF electrolytic capacitor for sound quality and the electrolytic capacitor for sound quality using the rubber-coated phenolic plate of the present invention.

[0008]

[Table 1]

As is apparent from Table 1, the product of the present invention can provide a high-quality electrolytic capacitor for sound quality in which smoothness of sound quality, transparency and depth feeling which are lacking in the conventional products are increased. In the above, the main polymer forming the rubber is ethylene / propylene / terpolymer (EP
T) was used, but styrene-butadiene rubber (SB
Even if R) is used, the same sound quality improving effect as described above can be obtained. Further, the silk fiber cloth is not limited to the plain weave cloth.

[0010]

As described above, according to the present invention, a sealing plate provided with a tough and supple silk fiber cloth is used instead of the rubber-coated resin plate alone as in the conventional case. It is possible to provide a high-quality electrolytic capacitor for sound quality, in which the smoothness, transparency, and depth feeling of the conventional sound quality are increased.

[Brief description of drawings]

FIG. 1 shows that the main polymer forming rubber is ethylene.
FIG. 3 is a cross-sectional view of a sound quality electrolytic capacitor using a rubber-coated phenolic plate of the present invention in which a propylene sheet is sandwiched between lower surfaces of a rubber-coated phenolic plate using propylene terpolymer (EPT) and a silk fiber cloth is arranged and molded.

FIG. 2 is a cross-sectional view of a rubber-coated phenolic plate in which a propylene sheet is sandwiched between the above rubber-coated phenolic plates and a silk fiber cloth is arranged and molded.

FIG. 3 is a perspective view of a conventional rubber-coated phenolic plate using ethylene propylene terpolymer (EPT) as a material.

FIG. 4 is a cross-sectional view of the above conventional rubber-coated phenolic plate.

[Explanation of symbols]

 1 Capacitor element 2 Aluminum case 3 Sleeve 4 Fixing material 5 Terminal 6 Rubber 7 Phenolic plate 8 Polypropylene sheet 9 Silk fiber cloth 10 Bottom plate

Claims (3)

[Claims] 1. A capacitor element obtained by winding an anode foil and a cathode foil made of an aluminum foil with a separator interposed between them is impregnated with an electrolytic solution, and the capacitor element is housed in a metal case.
An electrolytic capacitor sealed with a sealing plate, wherein the sealing plate is a rubber-coated resin plate, and a silk fiber cloth is arranged on the upper surface and / or the lower surface thereof. 2. The electrolytic capacitor according to claim 1, wherein the silk fiber cloth is a plain weave cloth, and a sealing plate on which the silk fiber cloth is arranged is used. 3. An ethylene propylene terpolymer (EP
T), or styrene-butadiene rubber (SBR)
The electrolytic capacitor according to claim 1, wherein the electrolytic capacitor is used.