JP2016162841A - Fixing material for electrolytic capacitor and electrolytic capacitor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing material for an electrolytic capacitor capable of obtaining sound of high quality when used for audio equipment, and also to provide the electrolytic capacitor using the same.SOLUTION: An electrolytic capacitor 20 includes: a capacitor element 7 formed by winding an anode foil and a cathode foil of valve metal while superposing the foils via electrolytic paper; a bottomed cylindrical outer case 12 in which the capacitor element 7 is housed; a fixing material 15 for fixing the capacitor element 7 in the outer case 12; and a sealing body for sealing an opening of the outer case 12. In this electrolytic capacitor 20, the fixing material 15 formed by mixing cellulose derived from animal or protist is used.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fixing material for an electrolytic capacitor and an electrolytic capacitor using the same, and more particularly to an acoustic electrolytic capacitor used in audio equipment.

  An electrolytic capacitor uses a metal called valve metal such as aluminum, tantalum, and niobium as an electrode, and uses an oxide film layer obtained by anodizing as a dielectric.

  In an aluminum electrolytic capacitor using aluminum as an electrode, a capacitor element is formed by winding an anode foil and a cathode foil that have been subjected to an etching process and an oxide film formation process through a separator, and are fixed by an element stopper tape. ing. This capacitor element is impregnated with a driving electrolyte, and then stored in a bottomed cylindrical outer case, and is fixed in the case using a fixing material.

  Further, a sealing body is attached to the opening of the exterior case, and the opening is sealed by drawing.

  In the self-standing substrate type and screw terminal type aluminum electrolytic capacitor, an anode terminal and a cathode terminal are formed on the outer end face of the sealing body. The ends of the anode terminal and the cathode terminal are electrically connected to the anode tab terminal and the cathode tab terminal drawn out from the capacitor element, respectively. In addition, the lead wire type aluminum electrolytic capacitor is such that the lead terminal electrically connected to the anode tab terminal and the cathode tab terminal drawn out from the capacitor element is drawn out through the insertion hole formed in the sealing body. ing.

  Electrolytic electrolytic capacitors using aluminum as an electrode are used for applications such as power circuit filters, coupling of circuit blocks, and decoupling in audio equipment. Here, the reproduced sound quality may vary depending on the material used for the electrolytic capacitor.

  For example, there is a problem that reproduction sound quality characteristics deteriorate due to propagation of externally generated vibration in the electrolytic capacitor. In order to solve this problem, it is attempted to prevent the reproduction sound quality characteristic from being deteriorated by improving the fixing material. For example, Patent Document 1 proposes an electrolytic capacitor in which protein powder containing fibroin as a main component is mixed with a fixing material (see Patent Document 1).

JP 11-45834 A

  However, the fibroin described in Patent Document 1 is produced from silk, and if any sericin contained in the silk fiber remains with fibroin, there is a possibility of causing discoloration by ultraviolet rays. Sound quality characteristics may be degraded. In addition, when using fibroin, it is necessary to fully consider the storage environment. Therefore, when the electrolytic capacitor described in Patent Document 1 is used for audio equipment, there is a problem that it is difficult to stably maintain high sound quality characteristics.

  The present invention has been made in view of the above problems, and provides a fixing material for an electrolytic capacitor that can stably obtain high sound quality characteristics when used in an audio device, and an electrolytic capacitor using the same. For the purpose.

  An electrolytic capacitor according to an embodiment of the present invention includes a capacitor element formed by stacking and winding a valve metal anode foil and a cathode foil via electrolytic paper, and a bottomed cylindrical outer case that houses the capacitor element And an electrolytic capacitor comprising: a fixing material that fixes the capacitor element in the outer case; and a sealing body that seals the opening of the outer case. It is characterized by using a fixing material.

  Moreover, the fixing material for an electrolytic capacitor according to one aspect of the present invention is a fixing material for an electrolytic capacitor that fixes the capacitor element of the electrolytic capacitor that houses the capacitor element in the outer case, It is characterized by being mixed with cellulose derived from animals or protists.

  Thereby, the quality of the sound reproduced | regenerated with the audio equipment using this electrolytic capacitor can be improved. Moreover, it is not necessary to consider the storage environment of the electrolytic capacitor, and high sound quality can be realized stably.

  Moreover, in the fixing material for an electrolytic capacitor according to one aspect of the present invention, the animal or protist-derived cellulose is cellulose obtained by subjecting squirt cellulose or bacterial cellulose to chemical treatment.

  Thereby, it is possible to effectively improve the sound quality.

  Furthermore, the fixing material for an electrolytic capacitor according to an embodiment of the present invention is characterized in that 1.0 to 20.0% by weight of the above squirt cellulose or bacterial cellulose is mixed.

  Thereby, sound quality can be improved more.

  According to the fixing material for an electrolytic capacitor of the present invention and the electrolytic capacitor using the same, high sound quality characteristics can be stably obtained when used in an audio device.

It is a disassembled perspective view which shows the capacitor | condenser element of the electrolytic capacitor which concerns on this embodiment. It is sectional drawing which shows the structure of the electrolytic capacitor which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a capacitor element of the electrolytic capacitor according to the present embodiment, and FIG. 2 is a cross-sectional view showing the configuration of the electrolytic capacitor according to the present embodiment. As shown in FIG. 1, a capacitor element 7 of an electrolytic capacitor includes an anode foil 1 that has been subjected to an etching process and an oxide film forming process, and a cathode foil 2 that has been subjected to an etching process via an electrolytic paper (separator) 3. And is fixed by an element stopper tape 6.

  The capacitor element 7 is impregnated with a driving electrolyte, and then stored in a bottomed cylindrical outer case 12 as shown in FIG. 2, and is a thermoplastic in which rubber is dispersed in a thermoplastic resin typified by polypropylene. It is fixed to an elastomer or tar pitch by a fixing material 15 formed by mixing animal or protozoan-derived cellulose.

Here, examples of the animal- or protist-derived cellulose include squirt cellulose and bacterial cellulose. In addition, it is preferable that this squirt cellulose or bacterial cellulose is mixed with polypropylene after chemical treatment to bond carboxymethyl groups.
The animal- or protist-derived cellulose of the present invention is not limited to squirt cellulose and bacterial cellulose, and other animal- or protist-derived cellulose may be used. Examples of the cellulose derived from animals or protists include cellulose derived from eukaryotic algae, and cellulose derived from eukaryotic algae may be used. Audio equipment using the electrolytic capacitor 20 in which the capacitor element 7 is fixed by such a fixing material 15 has high sound quality, and diversification of sound quality design can be achieved. The fixing material 15 particularly preferably contains 1 to 20% by weight of animal or protist-derived cellulose.

  A sealing body is attached to the opening of the outer case 12, and the opening is sealed by drawing. As the sealing body, a material obtained by bonding the elastic member 11 to the bakelite 10 is used. The outer case 12 is further covered with an outer sleeve 16.

  An anode terminal 8 and a cathode terminal 9 are formed on the outer end face of the sealing body (bakelite 10 and elastic member 11), and each of the anode terminal 8 and the cathode terminal 9 is located inside the sealing body. It is connected to the internal terminal 14A and the internal terminal 14B. Each of the internal terminal 14A and the internal terminal 14B is electrically connected to the anode lead lead 4 and the cathode lead lead 5 drawn from the capacitor element 7 via the crimping portions (or weld portions) 13A and 13B. .

  Here, the anode lead 4 is subjected to a chemical conversion treatment, but the cathode lead 5 is generally not subjected to a chemical conversion treatment. For any of the lead leads (the anode lead lead 4 and the cathode lead lead 5), a valve metal foil that is not subjected to surface processing is generally used.

  Furthermore, the substrate self-supporting type electrolytic capacitor 20 is sealed by a sealing body and a portion where the outer case 12 is curled.

  The electrolytic paper 3 used as a separator in the capacitor element 7 of the electrolytic capacitor 20 is a general electrolytic paper (craft type). Electrolytic paper is not limited to craft, and various types such as Manila and kraft / manila hemp may be used.

  Next, the manufacturing method of the electrolytic capacitor 20 of this embodiment is demonstrated in order of a manufacturing process.

(Etching process)
In an etching solution (strongly acidic aqueous solution such as hydrochloric acid), the surface of the aluminum foil is made uneven by electrochemically applying a DC voltage or an AC voltage to increase the surface area.

(Chemical conversion process)
By applying a DC voltage to the etching foil while the etching foil produced by the etching process is immersed in a chemical conversion solution (weakly acidic aqueous solution such as ammonium borate), an aluminum oxide film serving as a dielectric is formed on the surface of the etching foil. Thus, the anode foil 1 is produced. As the cathode foil 2, an etching foil produced by an etching process is used as it is without forming an aluminum oxide film.

(Casting and winding process)
As shown in FIG. 1, the electrode lead material is made up of the anode foil 1 and the cathode while winding the anode paper 1 and the cathode foil 2 via the electrolytic paper 3 so as to form a cylindrical capacitor element 7. The anode lead 4 and the cathode lead 5 are connected to the foils 2 respectively. When the winding is completed to the end, the winding end is stopped with the element stop tape 6. The anode lead 1 and the cathode lead 5 and the anode foil 1 and the cathode foil 2 may be connected to each other by a needle hole crimping method, a cold crimp (cold crimp), or the like.

(Impregnation process)
The capacitor element 7 is impregnated with the driving electrolyte by decompression or pressurization. The impregnation time at this time varies depending on the size of the capacitor element 7 and the type of the driving electrolyte, but in general, the larger the size of the capacitor element 7, the longer the impregnation time. Thereafter, a certain amount of excess driving electrolyte is removed by a centrifuge.

(Assembly process)
After the capacitor element 7 impregnated with the driving electrolyte and the sealing body (the bakelite 10 and the elastic member 11) are joined, the fixing material 15 is poured into the outer case 12. Immediately after that, the capacitor element to which the sealing body is bonded is inserted into the outer case 12 and sealed to keep airtight. Thereby, the capacitor element 7 is fixed to the outer case 12. Thereafter, the electrolytic capacitor 20 is configured by covering with the outer sleeve 16.

  Here, the fixing material 15 is produced by subjecting animal or protist origin-derived cellulose to chemical treatment to bind carboxymethyl groups, and then mixing with a fixing agent such as polypropylene and stirring. Examples of animal or protist-derived cellulose include squirt cellulose and bacterial cellulose. Specifically, the carboxymethyl group is bound by the following method. First, a monochloroacetic acid aqueous solution is put into squirt cellulose or bacterial cellulose soaked in an aqueous sodium hydroxide solution, and the cellulose is pulverized. Further, the squirt cellulose or bacterial cellulose is stirred at 60 ° C. for 3 hours, and then neutralized by adding acetic acid. After the neutralization treatment, squirt cellulose or bacterial cellulose is filtered with an aqueous methanol solution and dried to obtain cellulose having a carboxymethyl group bonded thereto.

(Aging process)
A DC voltage is applied to the electrolytic capacitor 20 (product) at a high temperature to repair the oxide film damaged by cutting or winding the foil.

  In the electrolytic capacitor 20 produced in this way, the fixing material 15 is mixed with animal or protist origin-derived cellulose, so that high viscosity is realized, so that the sound absorbing action is improved and the echo is suppressed. it can. Thereby, the sound quality of the audio equipment using the electrolytic capacitor 20 is improved. Furthermore, chemical treatment is applied to animal- or protist-derived cellulose, so that water solubility is improved and compatibility with the electrolyte is improved. In addition, animal- or protist-derived cellulose is diffused throughout the fixing material 15 and the fixing material 15 has a uniform property, so that the sound quality is stabilized.

  In addition, as the squirt cellulose or the bacterial cellulose has a higher degree of polymerization, and the carboxymethyl cellulose has a higher degree of polymerization, the viscosity increases. In particular, since squirt cellulose and bacterial cellulose tend to have a higher degree of polymerization than plant-derived cellulose, higher viscosity can be achieved, and sound quality is particularly improved.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

  The anode foil 1 and the cathode foil 2 are overlapped with each other through the electrolytic paper 3, and the wound electrolytic capacitor element 7 is impregnated with the driving electrolyte, and then the excess driving electrolyte is removed by a centrifuge. The capacitor element 7 is inserted into the outer case 12 together with a sealing body, and fixed by a fixing material 15, and a 69-type acoustic electrolytic capacitor 20 having a rating of 71V, 15000 μF, a diameter of 35 mm, and a length of 70 mm is manufactured and subjected to an aging treatment. went.

  The fixing material 15 used was a mixture of foyer cellulose or bacterial cellulose, which was subjected to the above-described chemical treatment and bonded with a carboxymethyl group, in polypropylene that was heated to a liquid state. In addition, the squirt cellulose used what was obtained by carrying out the chemical treatment by carrying out the acid dip after carrying out the alkali dip of the commercially available squirt. The bacterial cellulose used was obtained by washing a commercially available nata de coco with pure water, followed by a drying treatment.

Example 1
Example 1 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned squirt cellulose is mixed at a ratio of 0.1% by weight with the above-mentioned polypropylene.

(Example 2)
The present Example 2 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 0.5% by weight.

(Example 3)
The present Example 3 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 1% by weight.

Example 4
This Example 4 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 5% by weight.

(Example 5)
This Example 5 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 10% by weight.

(Example 6)
The present Example 6 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 20% by weight.

(Example 7)
Example 7 is an electrolytic capacitor using a fixing material 15 in which the above-mentioned polypropylene is mixed with the above-mentioned polypropylene at a ratio of 30% by weight.

(Example 8)
Example 8 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 0.1% by weight.

Example 9
Example 9 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 0.5% by weight.

(Example 10)
Example 10 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 1% by weight.

(Example 11)
Example 11 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 5% by weight.

(Example 12)
Example 12 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 10% by weight.

(Example 13)
Example 13 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 20% by weight.

(Example 14)
Example 14 is an electrolytic capacitor using a fixing material 15 in which the bacterial cellulose is mixed with the polypropylene at a ratio of 30% by weight.

(Conventional example)
A conventional example is an electrolytic capacitor using as a fixing material the polypropylene in which neither the squirt cellulose nor the bacterial cellulose is mixed.

  The electrolytic capacitors of Examples 1 to 14 and the electrolytic capacitor of the conventional example were mounted on the power filter of the pre-main amplifier, and the reproduced sound quality was evaluated. There were three test listeners, and each item was evaluated with a maximum of 10 points, and the average of the three evaluation points was used. Moreover, the comprehensive evaluation score was shown by the total value of the evaluation score of 10 items, and it was set as a full score of 100 points. Tables 1 and 2 show the evaluation results of the reproduction sound quality.

  Table 1 and Table 2 show the following. The electrolytic capacitors of Examples 1 to 14 had a higher overall evaluation score than the conventional electrolytic capacitors, and could reproduce high quality sound. In addition, the electrolytic capacitors of Examples 3 to 6 in which the ratio of squirt cellulose mixed in the fixing material is 1 to 20% by weight, and the examples in which the ratio of bacterial cellulose mixed in the fixing material is 1 to 20% by weight With respect to 10 to 13 electrolytic capacitors, particularly high quality sound quality could be reproduced.

  Moreover, in the above-mentioned Example, although the polypropylene was used as a fixing agent, this invention is not limited to this. The same effect can be obtained by using polyethylene, polystyrene, polyvinyl chloride, polyester, or polyamide.

  Furthermore, in the above-mentioned examples, the aluminum foil was not formed as the cathode foil, but the etching foil produced by the etching process was used as it was, but the one subjected to the oxide film formation treatment in addition to the etching treatment was used. However, the same effect can be obtained.

  In the above-described embodiment, the substrate self-supporting type electrolytic capacitor is applied, but the present invention is not limited to this. As long as the fixing material can be poured, the same effect can be obtained with other types of electrolytic capacitors.

  Furthermore, in the above-described embodiment, the case where the electrolytic capacitor is mounted on the power filter of the pre-main amplifier has been described. However, the present invention is not limited to this, and is used for applications such as coupling and decoupling of other circuit blocks. The same effect can be obtained by applying the present invention to the electrolytic capacitor.

1 Anode foil 2 Cathode foil 3 Electrolytic paper (separator)
4 Cathode extraction lead 5 Cathode extraction lead 6 Element stop tape 7 Capacitor element 8 Anode terminal 9 Cathode terminal 10 Bakelite 11 Elastic member 12 Exterior case 13A, 13B Caulking part (or welded part)
14A, 14B Internal terminal 15 Fixing material 16 Exterior sleeve 20 Electrolytic capacitor

Claims (6)

A capacitor element formed by superposing and winding a valve metal anode foil and a cathode foil through electrolytic paper;
A bottomed cylindrical outer case for storing the capacitor element;
A fixing material for fixing the capacitor element in the outer case;
An electrolytic capacitor comprising a sealing body that seals the opening of the outer case,
An electrolytic capacitor using the fixing material formed by mixing animal or protozoan-derived cellulose.   2. The electrolytic capacitor according to claim 1, wherein the animal or protist origin-derived cellulose is cellulose obtained by subjecting squirt cellulose or bacterial cellulose to chemical treatment.   The electrolytic capacitor according to claim 2, wherein the fixing material is a mixture of 1.0 to 20.0 wt% of the squirt cellulose or bacterial cellulose. An electrolytic capacitor fixing material for fixing the capacitor element of the electrolytic capacitor that houses the capacitor element in the outer case in the outer case,
A fixing material for an electrolytic capacitor, comprising a mixture of animal or protist-derived cellulose.   5. The fixing material for an electrolytic capacitor according to claim 4, wherein the animal or protist-derived cellulose is cellulose obtained by subjecting sea squirt or bacterial cellulose to chemical treatment. The fixing material for an electrolytic capacitor according to claim 5, wherein 1.0 to 20.0% by weight of the squirt cellulose or bacterial cellulose is mixed.