JP5894026B2 - Method for manufacturing acoustic electrolytic capacitor - Google Patents

Description

The present invention relates to a manufacturing method of the 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.

  An aluminum electrolytic capacitor using aluminum as an electrode is a capacitor element in which an anode foil and a cathode foil that have been subjected to etching treatment and oxide film formation treatment are wound through a separator (electrolytic paper), and are fixed by an element fastening tape. Is formed. The capacitor element is impregnated with a driving electrolyte and then accommodated in a bottomed cylindrical outer case.

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

The substrate self-supporting type aluminum electrolytic capacitor has an anode terminal and a cathode terminal formed on the outer end surface of the sealing body, and the anode tab terminal and the cathode tab terminal drawn out from the capacitor element are electrically connected to the lower ends of these terminals. It is connected to the.
Further, in the lead wire type aluminum electrolytic capacitor, the lead terminal electrically connected to the anode tab terminal and the cathode tab terminal drawn out from the capacitor element is drawn to the outside through the insertion hole provided in the sealing body. .

  In audio equipment, electrolytic electrolytic capacitors using aluminum as an electrode are used for power circuit filters, coupling and decoupling of each circuit block, and the sound quality reproduced depends on the materials used and the manufacturing method. The phenomenon is a known fact.

  By the way, what used the thing which added the glass bead as the separator of an aluminum electrolytic capacitor is also considered (refer patent document 1). The purpose of adding glass beads is to reduce the short-circuit defect rate, to suppress leakage current values and impedance values at high frequencies, and to improve electrical characteristics.

JP 2008-117950 A

  Thus, the conventional separator with glass beads added is intended to improve the electrical characteristics of aluminum electrolytic capacitors using the separator, and to improve sound quality when aluminum electrolytic capacitors are used in audio equipment. It was not intended.

An object of this invention is to provide the manufacturing method of the electrolytic capacitor for acoustics which can obtain a sound with high sound quality, when it uses for an audio equipment.

The method of manufacturing an acoustic electrolytic capacitor of the present invention superimposes an anode foil and a cathode foil of valve metal through the electrolytic paper, a method for producing acoustic electrolytic capacitor is used for audio equipment made by winding A step of preparing an electrolytic paper mixed with powder of aluminum magnesium silicate having an average particle size of 0.02 to 20.0 μm, and the anode through the electrolytic paper mixed with powder of aluminum magnesium silicate A step of winding the foil and the cathode foil, and the mixing ratio of the powder of aluminum magnesium silicate in the electrolytic paper is 0.01 to 30.0% by weight with respect to the weight of the electrolytic paper It is characterized by.

  According to this configuration, the sound quality can be effectively improved by setting the average particle diameter and the mixing ratio of the aluminum magnesium silicate powder mixed on the electrolytic paper to predetermined values.

According to acoustic electrolytic capacitor manufacturing method of the present invention, can be provided when used in audio equipment, the acoustic electrolytic capacitor can have high quality sound.

It is a disassembled perspective view of the capacitor | condenser element used with the electrolytic capacitor of this invention. It is sectional drawing which shows the structure of the electrolytic capacitor of this invention. It is a flowchart which shows the manufacturing process of the electrolytic capacitor which concerns on this Embodiment.

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

FIG. 1 is a 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. As shown in FIG. 1, in an electrolytic capacitor, an anode foil 1 and a cathode foil 2 that have been subjected to an etching process and an oxide film formation process are wound through an electrolytic paper (separator) 3, and an element stopper tape 6 is used. A capacitor element 7 is formed by being fixed.
The capacitor element 7 is impregnated with the driving electrolyte and then accommodated in a bottomed cylindrical outer case 12 (FIG. 2).

  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 exterior case 12 may be provided with an element fixing agent 15 that fixes the capacitor element 7.

  An anode terminal 8 and a cathode terminal 9 are formed on the outer end surface of the sealing body (the bakelite 10 and the elastic member 11), and the lower end portions of these terminals 8 and 9 are the anode lead lead 4 drawn from the capacitor element 7 and The cathode lead 5 is electrically connected through the crimped portions (or welded 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.

  Further, the sealing of the substrate self-supporting type aluminum electrolytic capacitor is made by the elastic member 11 of the sealing body and the curled portion of the outer case 12.

The electrolytic paper 3 used as a separator in this electrolytic capacitor is a general electrolytic paper (craft type), and this electrolytic paper is mixed with aluminum magnesium silicate powder.
Electrolytic paper is not limited to craft type, and various types such as manila type and kraft / manila hemp mixed paper can be used.

In the case of this embodiment, when making a general electrolytic paper (craft type), a powder obtained by mixing aluminum magnesium silicate powder having a predetermined average particle diameter at a predetermined weight percentage is used.
With respect to the powder of aluminum magnesium silicate, various types of average particle diameter and weight% were prepared and subjected to a characteristic test. The test results will be described later.

  Next, a method for manufacturing the electrolytic capacitor of the present embodiment will be described. FIG. 3 is a flowchart showing manufacturing steps of the electrolytic capacitor according to this embodiment.

(Casting and winding process)
An electrode lead lead material is connected to each of the anode foil 1 and the cathode foil 2 while being wound around the cylindrical capacitor element 7 via the electrolytic paper 3 shown in FIG. The electrolytic paper 3 is electrolytic paper obtained by mixing aluminum magnesium silicate powder.
Finally, the end of winding is stopped with the element stop tape 6, and the element fixing member 15 is fitted to the outer peripheral surface of the lower end portion of the capacitor element 7 as shown in FIG. 2 (step S101). Examples of the connection method between the electrode lead material and the electrode foil include a needle hole crimping method and cold crimping (cold crimping).

(Impregnation process)
Capacitor element 7 is impregnated with the driving electrolyte by reducing pressure or increasing pressure (step S102). The impregnation time at this time varies depending on the size of the capacitor element 7 and the type of the driving electrolyte, but generally the larger the element size, the longer the impregnation time. Thereafter, a certain amount of excess driving electrolyte was removed by a centrifuge.

(Assembly process)
After the capacitor element 7 impregnated with the driving electrolyte and the sealing body (bakelite 10 and elastic member 11) are joined, they are put in the outer case 12 and sealed to keep the airtight. Then, it coat | covers with the exterior sleeve 16 (FIG. 2) (step S103).

(Aging process)
A DC voltage is applied to the electrolytic capacitor (product) at a high temperature to repair the oxide film damaged by cutting or winding the foil (step S104).

  The present invention will be described more specifically with reference to the following examples.

After superposing the anode foil and the cathode foil through electrolytic paper and impregnating the wound substrate self-supporting type aluminum electrolytic capacitor element 7 with the driving electrolyte, the excess driving electrolyte was removed with a centrifuge. .
The capacitor element 7 was inserted into the outer case 12 together with a sealing body to produce an electrolytic capacitor having a diameter of 35 mm, a length of 50 mm, a rated voltage of 50 V, and a capacitance of 10,000 μF, and was subjected to an aging treatment.

Example 1
Example 1 uses electrolytic paper made by mixing powder of aluminum magnesium silicate having an average particle size of 0.02 μm with a ratio of 0.01% by weight with respect to electrolytic paper. This is an electrolytic capacitor.

(Example 2)
In Example 2, a general electrolytic paper (kraft type) obtained by mixing a powder of aluminum magnesium silicate having an average particle size of 0.02 μm at a ratio of 1.00% by weight with respect to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

(Example 3)
In Example 3, a general electrolytic paper (kraft) obtained by mixing aluminum magnesium silicate powder having an average particle size of 0.02 μm with a ratio of 30.0% by weight with respect to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

Example 4
Example 4 uses electrolytic paper made by mixing powder of aluminum magnesium silicate having an average particle diameter of 20.0 μm at a ratio of 0.01% by weight with respect to electrolytic paper. This is an electrolytic capacitor.

(Example 5)
In Example 5, a general electrolytic paper (Kraft) mixed with a powder of aluminum magnesium silicate having an average particle diameter of 20.0 μm at a ratio of 1.00% by weight to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

(Example 6)
In Example 6, a general electrolytic paper (Kraft) mixed with 30.0% by weight of aluminum magnesium silicate powder having an average particle diameter of 20.0 μm with respect to the electrolytic paper was used as the electrolytic paper. This is an electrolytic capacitor.

(Example 7)
This Example 7 uses electrolytic paper made by mixing powder of aluminum magnesium silicate having an average particle diameter of 30.0 μm at a ratio of 30.0% by weight with respect to electrolytic paper on general-purpose electrolytic paper (craft type). This is an electrolytic capacitor.

(Example 8)
In Example 9, a general electrolytic paper (craft type) mixed with aluminum magnesium silicate powder having an average particle size of 0.01 μm in an amount of 30.0% by weight with respect to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

Example 9
In Example 9, a general electrolytic paper (kraft) mixed with 0.005% by weight of aluminum magnesium silicate powder having an average particle diameter of 20.0 μm with respect to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

(Example 10)
In Example 10, a general electrolytic paper (Kraft) mixed with aluminum magnesium silicate powder having an average particle diameter of 20.0 μm at a ratio of 40.0% by weight to the electrolytic paper is used as the electrolytic paper. This is an electrolytic capacitor.

(Conventional example)
The conventional example is an electrolytic capacitor using, as an electrolytic paper, a general electrolytic paper (kraft type) that is not mixed with aluminum magnesium silicate powder.

The electrolytic capacitors of Examples 1 to 10 and the electrolytic capacitor of the conventional example were mounted on a power filter of a 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.
The total evaluation score is the total value of the evaluation scores of 10 items, with a maximum score of 100. Table 1 shows the evaluation results of the reproduced sound quality.

Table 1 shows the following. The electrolytic capacitor using the electrolytic paper 3 mixed with the powder of aluminum magnesium silicate of Examples 1 to 6 of the present invention has a higher overall evaluation point than the conventional electrolytic capacitor and can reproduce high sound quality. It was.
And, the powder of aluminum magnesium silicate to be mixed, Examples 1 to 6 having an average particle size of 0.02 to 20.0 μm and an addition amount of 0.01 to 30.0% by weight are outside the above range. The overall evaluation points were higher than those of Examples 7 to 10, and higher sound quality could be reproduced.

In the present embodiment, by using the electrolytic paper 3 obtained by mixing the powder of aluminum magnesium silicate, the sound quality can be improved without changing the manufacturing process of the electrolytic capacitor.
Further, in the electrolytic paper 3 in which the aluminum magnesium silicate powder is mixed, the aluminum magnesium silicate powder is integrated with the electrolytic paper 3 so that the electrolytic paper 3 can be easily handled in the electrolytic capacitor manufacturing process. become.

  In the above-described embodiments, the present invention is applied to a substrate self-supporting type electrolytic capacitor. However, the same effect can be obtained when applied to a lead-type or chip-type electrolytic capacitor.

  In the above-described embodiments, 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. When the present invention is applied to an aluminum electrolytic capacitor, good results can be obtained.

1 Anode foil 2 Cathode foil 3 Electrolytic paper (separator)
4 Anode lead 5 Cathode 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)
14 Internal terminal 15 Element fixing material 16 Exterior sleeve 50 Fiber 60 Fiber body

Claims (1)

A method of manufacturing an electrolytic capacitor for acoustics used in audio equipment in which an anode foil and a cathode foil of a valve metal are overlapped and wound via electrolytic paper ,
Preparing an electrolytic paper mixed with powder of aluminum magnesium silicate having an average particle size of 0.02 to 20.0 μm;
Winding the anode foil and the cathode foil through the electrolytic paper mixed with the aluminum magnesium silicate powder;
With
The powder混抄ratio of the magnesium aluminum silicate in the electrolytic paper, manufacturing method of the acoustic electrolytic capacitor characterized in that said a 0.01 to 30.0% by weight relative to the weight of electrolytic paper.

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