JPH0782969B2 - Method for manufacturing electrode foil for aluminum electrolytic capacitor - Google Patents

Method for manufacturing electrode foil for aluminum electrolytic capacitor

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Publication number
JPH0782969B2
JPH0782969B2 JP2237625A JP23762590A JPH0782969B2 JP H0782969 B2 JPH0782969 B2 JP H0782969B2 JP 2237625 A JP2237625 A JP 2237625A JP 23762590 A JP23762590 A JP 23762590A JP H0782969 B2 JPH0782969 B2 JP H0782969B2
Authority
JP
Japan
Prior art keywords
boric acid
foil
electrolytic capacitor
electrode foil
aluminum electrolytic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2237625A
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Japanese (ja)
Other versions
JPH04116911A (en
Inventor
学 数原
和幸 安達
優 遠藤
昇 羽賀
幹夫 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elna Co Ltd
AGC Inc
Original Assignee
Asahi Glass Co Ltd
Elna Co Ltd
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Application filed by Asahi Glass Co Ltd, Elna Co Ltd filed Critical Asahi Glass Co Ltd
Priority to JP2237625A priority Critical patent/JPH0782969B2/en
Publication of JPH04116911A publication Critical patent/JPH04116911A/en
Publication of JPH0782969B2 publication Critical patent/JPH0782969B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はアルミニウム電解コンデンサ用電極箔の製造方
法に関するものである。TECHNICAL FIELD The present invention relates to a method for manufacturing an electrode foil for an aluminum electrolytic capacitor.

〔従来の技術〕[Conventional technology]

一般に、この種の電極箔は次のようにして製造されてい
る。まず、エッチングされたアルミニウム箔を用意し、
このアルミニウム箔を燐酸や硼酸などの水溶液に浸漬
し、一定の電圧を印加して陽極酸化処理（化成処理）を
行ない、所望所望厚さの酸化皮膜を生成させるようにし
ている。Generally, this kind of electrode foil is manufactured as follows. First, prepare the etched aluminum foil,
This aluminum foil is immersed in an aqueous solution of phosphoric acid, boric acid or the like, and a certain voltage is applied to perform anodizing treatment (chemical conversion treatment) to form an oxide film having a desired and desired thickness.

そして、酸またはアルカリ水溶液中に浸漬する減極処理
および数100℃の高温雰囲気中に数分間放置する熱処理
工程を行なう。これら化成処理、減極処理、熱処理は、
通常数回繰り返される。Then, a depolarization treatment of immersing in an acid or alkali aqueous solution and a heat treatment step of leaving it in a high temperature atmosphere of several 100 ° C. for several minutes are performed. These chemical conversion treatment, depolarization treatment, heat treatment,
Usually repeated several times.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

しかしながら、この方法では静電容量を高めるのには限
度があり、最近とみに要望されているより一層の小形か
つ高容量化に応えることができない。However, this method has a limit to increase the electrostatic capacity, and cannot meet the demand for smaller size and higher capacity recently.

本発明は、このような事情に鑑みなされたもので、より
高い静電容量が得られることができるようにしたアルミ
ニウム電解コンデンサ用電極箔の製造方法を提供するこ
とにある。The present invention has been made in view of such circumstances, and an object thereof is to provide a method for manufacturing an electrode foil for an aluminum electrolytic capacitor, which is capable of obtaining a higher capacitance.

〔課題を解決するための手段〕[Means for Solving the Problems]

上記目的を達成するため、本発明においては、まず、エ
ッチングされたアルミニウム箔を高温の純水中に所定時
間浸漬し、しかる後に酒石酸またはその塩もしくはリン
ゴ酸またはその塩を添加した硼酸水溶液中にそのアルミ
ニウム箔を浸漬し、所定時間電圧を印加して陽極酸化を
行なうようにしている。To achieve the above object, in the present invention, first, the etched aluminum foil is immersed in high temperature pure water for a predetermined time, and then tartaric acid or a salt thereof or malic acid or a boric acid aqueous solution added with a salt thereof is added. The aluminum foil is dipped and a voltage is applied for a predetermined time to perform anodization.

この場合、アルミニウム箔を硼酸水溶液中に浸漬し、所
定時間電圧を印加して第１の陽極酸化を行ない、引き続
きそのアルミニウム箔を酒石酸またはその塩もしくはリ
ンゴ酸またはその塩を含む硼酸水液中に浸漬し、所定時
間電圧を印加して第２の陽極酸化を行なうようにして多
段階陽極酸化してもよい。また、第１の陽極酸化工程と
第２の陽極酸化工程とを入れ替えても効果がある。In this case, the aluminum foil is immersed in an aqueous solution of boric acid, a voltage is applied for a predetermined time to carry out the first anodic oxidation, and then the aluminum foil is immersed in an aqueous solution of boric acid containing tartaric acid or a salt thereof or malic acid or a salt thereof. The multi-step anodic oxidation may be performed by immersing and applying a voltage for a predetermined time to perform the second anodic oxidation. Further, it is also effective to replace the first anodic oxidation process with the second anodic oxidation process.

引き続いて、減極処理、加熱雰囲気中での熱処理、再陽
極酸化処理が少なくとも１回行なわれるのであるが、こ
の方法によれば、従来法に比べて静電容量が約４〜10％
以上増大する。Subsequently, depolarization treatment, heat treatment in a heating atmosphere, and re-anodizing treatment are performed at least once. According to this method, the capacitance is about 4 to 10% compared to the conventional method.
More than that.

なお、上記硼酸水溶液中における酒石酸もしくはリンゴ
酸の濃度は0.002〜1.0wt％、液温は70〜100℃であるこ
とが好ましい。硼酸の濃度は0.5〜10wt％が好ましい。The concentration of tartaric acid or malic acid in the aqueous boric acid solution is preferably 0.002 to 1.0 wt% and the liquid temperature is preferably 70 to 100 ° C. The concentration of boric acid is preferably 0.5 to 10 wt%.

本発明においては、酒石酸またはその塩もしくはリンゴ
酸またはその塩に代えて、その前駆体を適宜用いてもよ
い。この場合の前駆体としては、酸アミド、エステル、
酸無水物などが例示される。In the present invention, a precursor thereof may be appropriately used in place of tartaric acid or a salt thereof or malic acid or a salt thereof. As the precursor in this case, acid amide, ester,
An acid anhydride etc. are illustrated.

他方、上記減極処理にはpH7〜９で液温50〜90℃のアン
モニア水（濃度0.001〜0.2wt％）またはpH4〜８の燐酸
水溶液（濃度0.1〜8wt％）などが用いられ、その浸漬時
間は１〜５分程度とされる。さらに、熱処理は400〜500
℃で１〜３分程度が好ましい。On the other hand, for the above depolarization treatment, ammonia water having a pH of 7 to 9 and a liquid temperature of 50 to 90 ° C. (concentration of 0.001 to 0.2 wt%) or a phosphoric acid aqueous solution of pH 4 to 8 (concentration of 0.1 to 8 wt%) is used. The time is about 1 to 5 minutes. Furthermore, heat treatment is 400-500
It is preferably about 1 to 3 minutes at ℃.

〔実 施 例〕〔Example〕

以下、本発明の具体的な実施例と比較例を説明するが、
本発明は同実施例に限定されるものではない。Hereinafter, specific examples and comparative examples of the present invention will be described.
The present invention is not limited to the same embodiment.

《実施例１》 （Ａ）純度99.99％で厚さ100μｍのアルミニウムエッチ
ング箔を用意した。この場合、そのエッチング倍率はエ
ッチングしていない平坦箔に対して20倍である。Example 1 (A) An aluminum etching foil having a purity of 99.99% and a thickness of 100 μm was prepared. In this case, the etching magnification is 20 times that of the unetched flat foil.

（Ｂ）このアルミニウムエッチング箔を液温98℃以上の
純水中で15分間熱処理した。(B) This aluminum etching foil was heat-treated in pure water having a liquid temperature of 98 ° C. or higher for 15 minutes.

（Ｃ）次に、純水11（リットル）あたり硼酸20gおよび
酒石酸アンモニウム0.1gを添加した硼酸水溶液、液温85
℃中にアルミニウムエッチング箔を浸漬し、電流密度10
mA/cm2の電流を流し、化成電圧600Vまで上昇させ、同電
圧を40分間印加して本化成を行なった。(C) Next, boric acid solution containing 20 g of boric acid and 0.1 g of ammonium tartrate per 11 (liter) of pure water, liquid temperature 85
Immerse aluminum etching foil in ℃, current density 10
A current of mA / cm 2 was flown to raise the formation voltage to 600 V, and the same voltage was applied for 40 minutes to perform the main formation.

（Ｄ）化成後のアルミニウムエッチング箔を液温70℃、
pH7〜９に調整したアンモニア水に３分間浸漬し、減極
処理を行なった。(D) The aluminum etching foil after chemical conversion has a liquid temperature of 70 ° C,
Depolarization treatment was carried out by immersing in ammonia water adjusted to pH 7 to 9 for 3 minutes.

（Ｅ）500℃の加熱雰囲気中で２分間熱処理した。(E) Heat treatment was performed for 2 minutes in a heating atmosphere of 500 ° C.

（Ｆ）再化成として、純水11あたり硼酸20gおよび酒石
酸アンモニウム0.1gを添加した液温85℃の硼酸水溶液中
に再度浸漬し、電流密度10mA/cm2の電流を流し、化成電
圧600Vまで上昇させ、同電圧を13分間印加した。(F) As a re-formation, it is immersed again in a boric acid aqueous solution at a liquid temperature of 85 ° C in which 20 g of boric acid and 0.1 g of ammonium tartrate are added per 11 parts of pure water, and a current having a current density of 10 mA / cm 2 is applied to raise the formation voltage to 600 V Then, the same voltage was applied for 13 minutes.

（Ｇ）500℃の加熱雰囲気中で２分間熱処理した。(G) Heat treatment was performed for 2 minutes in a heating atmosphere of 500 ° C.

（Ｈ）再び、純水11あたり硼酸20gおよび酒石酸アンモ
ニウム0.1gを添加した液温85℃の硼酸水溶液中に浸漬
し、電流密度10mA/cm2の電流を流し、化成電圧600Vまで
上昇させ、同電圧を13分間印加して再化成を行なった。(H) Again, it was immersed in a boric acid aqueous solution at a liquid temperature of 85 ° C in which 20 g of boric acid and 0.1 g of ammonium tartrate were added per 11 of pure water, and a current having a current density of 10 mA / cm 2 was passed to raise the formation voltage to 600 V. The voltage was applied for 13 minutes for re-formation.

（Ｉ）水洗し、乾燥させて化成箔の静電容量を測定した
ところ、その静電容量は0..430μF/cm2であった。(I) After washing with water and drying, the capacitance of the formed foil was measured and found to be 0.430 μF / cm 2 .

（Ｊ）この化成箔（15mm×270mm）を陽極として、定格4
00V17μＦの電解コンデンサを作成したところ、その静
電容量は17.4μＦであった。(J) With this formed foil (15 mm x 270 mm) as the anode, a rating of 4
When an electrolytic capacitor of 00V 17 μF was prepared, its electrostatic capacity was 17.4 μF.

《実施例２》 （Ａ）純度99.99％で厚さ100μｍのアルミニウムエッチ
ング箔を用意した。この場合、そのエッチング倍率はエ
ッチングしていない平坦箔に対して20倍である。Example 2 (A) An aluminum etching foil having a purity of 99.99% and a thickness of 100 μm was prepared. In this case, the etching magnification is 20 times that of the unetched flat foil.

（Ｂ）このアルミニウムエッチング箔を液温98℃以上の
純水中で15分間熱処理した。(B) This aluminum etching foil was heat-treated in pure water having a liquid temperature of 98 ° C. or higher for 15 minutes.

（Ｃ）次に、純水11（リットル）あたり硼酸20gおよび
リンゴ酸アンモニウム0.1gを添加した硼酸水溶液、液温
85℃中にアルミニウムエッチング箔を浸漬し、電流密度
10mA/cm2の電流を流し、化成電圧600Vまで上昇させ、同
電圧を40分間印加して本化成を行なった。(C) Next, boric acid aqueous solution containing 20 g of boric acid and 0.1 g of ammonium malate per 11 (liter) of pure water, the liquid temperature
Immersion of aluminum etching foil in 85 ℃, current density
A current of 10 mA / cm 2 was passed to raise the formation voltage to 600 V, and the same voltage was applied for 40 minutes to perform the main formation.

（Ｄ）化成後のアルミニウムエッチング箔を液温70℃、
3.5wt％に調整した燐酸水溶液に３分間浸漬し、減極処
理を行なった。(D) The aluminum etching foil after chemical conversion has a liquid temperature of 70 ° C,
The sample was immersed in a phosphoric acid aqueous solution adjusted to 3.5 wt% for 3 minutes for depolarization treatment.

（Ｅ）500℃の加熱雰囲気中で２分間熱処理した。(E) Heat treatment was performed for 2 minutes in a heating atmosphere of 500 ° C.

（Ｆ）再化成として、純水11あたり硼酸20gおよびリン
ゴ酸アンモニウム0.1gを添加した液温85℃の硼酸水溶液
中に再度浸漬し、電流密度10mA/cm2の電流を流し、化成
電圧600Vまで上昇させ、同電圧を13分間印加した。(F) As re-formation, re-immerse in a boric acid aqueous solution at a liquid temperature of 85 ° C in which 20 g of boric acid and 0.1 g of ammonium malate were added per 11 parts of pure water, and a current having a current density of 10 mA / cm 2 was applied until the formation voltage of 600 V The voltage was raised and the same voltage was applied for 13 minutes.

（Ｇ）500℃の加熱雰囲気中で２分間熱処理した。(G) Heat treatment was performed for 2 minutes in a heating atmosphere of 500 ° C.

（Ｈ）再び、純水11あたり硼酸20gおよびリンゴ酸アン
モニウム0.1gを添加した液温85℃の硼酸水溶液中に浸漬
し、電流密度10mA/cm2の電流を流し、化成電圧600Vまで
上昇させ、同電圧を13分間印加して再化成を行なった。(H) Again, it was immersed in a boric acid aqueous solution having a liquid temperature of 85 ° C. to which 20 g of boric acid and 0.1 g of ammonium malate were added per 11 pure waters, and a current having a current density of 10 mA / cm 2 was applied to raise the formation voltage to 600 V, The same voltage was applied for 13 minutes for re-formation.

（Ｉ）水洗し、乾燥させて化成箔の静電容量を測定した
ところ、その静電容量は0..430μF/cm2であった。(I) After washing with water and drying, the capacitance of the formed foil was measured and found to be 0.430 μF / cm 2 .

（Ｊ）この化成箔（15mm×270mm）を陽極として、実施
例１と同様、定格400V17μＦの電解コンデンサを作成し
たところ、その静電容量は17.4μＦであった。(J) When this formed foil (15 mm × 270 mm) was used as an anode, an electrolytic capacitor having a rating of 400 V and 17 μF was prepared in the same manner as in Example 1. Its electrostatic capacity was 17.4 μF.

〈比較例１〉 （ａ）純度99.99％で厚さ100μｍのアルミニウムエッチ
ング箔を用意した。この場合、そのエッチング倍率をエ
ッチングしていない平坦箔に対して20倍である。Comparative Example 1 (a) An aluminum etching foil having a purity of 99.99% and a thickness of 100 μm was prepared. In this case, the etching magnification is 20 times that of the unetched flat foil.

（ｂ）このアルミニウムエッチング箔を液温98℃以上の
純水中で15分間熱処理した。(B) This aluminum etching foil was heat-treated in pure water having a liquid temperature of 98 ° C. or higher for 15 minutes.

（ｃ）純水11（リットル）あたり硼酸20gを添加した硼
酸水溶液、液温85℃中にアルミニウムエッチング箔を浸
漬し、電流密度10mA/cm2の電流を流し、化成電圧600Vま
で上昇させ、同電圧を40分間印加して本化成を行なっ
た。(C) Immerse the aluminum etching foil in a boric acid aqueous solution containing 20 g of boric acid per 11 (liter) of pure water and a liquid temperature of 85 ° C., apply a current having a current density of 10 mA / cm 2 to raise the formation voltage to 600 V, and This chemical conversion was performed by applying a voltage for 40 minutes.

（ｄ）化成後のアルミニウムエッチング箔を液温70℃、
pH7〜９に調整したアンモニア水に３分間浸漬し、減極
処理を行なった。(D) Liquid temperature of the aluminum etching foil after chemical conversion is 70 ° C,
Depolarization treatment was carried out by immersing in ammonia water adjusted to pH 7 to 9 for 3 minutes.

（ｅ）500℃の加熱雰囲気中で２分間熱処理した。(E) Heat treatment was performed for 2 minutes in a heating atmosphere at 500 ° C.

（ｆ）再化成として、純水11あたり硼酸20gを添加した
液温85℃の硼酸水溶液中に再度浸漬し、電流密度10mA/c
m2の電流を流し、化成電圧600Vまで上昇させ、同電圧を
13分間印加した。(F) As re-formation, re-immerse in a boric acid aqueous solution at a liquid temperature of 85 ° C with 20 g of boric acid added per 11 of pure water to obtain a current density of 10 mA / c
Apply a current of m 2 to raise the formation voltage to 600V,
It was applied for 13 minutes.

（ｇ）500℃の加熱雰囲気中で２分間熱処理した。(G) Heat treatment was performed in a heating atmosphere of 500 ° C. for 2 minutes.

（ｈ）再び、純水11あたり硼酸20gを添加した液温85℃
の硼酸水溶液中に浸漬し、電流密度10mA/cm2の電流を流
し、化成電圧600Vまで上昇させ、同電圧を３分間印加し
て再化成を行なった。(H) Again, a liquid temperature of 85 ° C with 20 g of boric acid added per 11 of pure water
Was immersed in an aqueous solution of boric acid, and a current density of 10 mA / cm 2 was applied to increase the formation voltage to 600 V, and the same voltage was applied for 3 minutes for re-formation.

（ｉ）水洗し、乾燥させて化成箔の静電容量を測定した
ところ、その静電容量は0.423μF/cm2であった。(I) When the capacitance of the formed foil was measured by washing with water and drying, the capacitance was 0.423 μF / cm 2 .

（ｊ）この化成箔（15mm×270mm）を陽極として、実施
例１と同様、定格400V17μＦの電解コンデンサを作成し
たところ、その静電容量は16.8μＦであった。(J) When this formed foil (15 mm × 270 mm) was used as an anode to prepare an electrolytic capacitor rated at 400 V and 17 μF as in Example 1, the electrostatic capacity was 16.8 μF.

次表に上記各実施例1,2と比較例１の静電容量測定値を
示す。The following table shows the measured capacitance values of Examples 1 and 2 and Comparative Example 1 described above.

〈比較〉上記のように、この発明によると、静電容量は
従来法に比べて約3.6％増大している。 <Comparison> As described above, according to the present invention, the capacitance is increased by about 3.6% as compared with the conventional method.

〔発明の効果〕〔The invention's effect〕

以上説明したように、本発明によれば、エッチングされ
たアルミニウム箔を純水ボイルし、次いで酒石酸または
その塩もしくはリンゴ酸またはその塩を添加した硼酸水
溶液中にそのアルミニウム箔を浸漬し、所定時間電圧を
印加して陽極酸化を行なうようにしたことにより、静電
容量の高い電極箔が製造される。As described above, according to the present invention, the etched aluminum foil is boiled with pure water, and then the aluminum foil is immersed in a boric acid aqueous solution to which tartaric acid or a salt thereof or malic acid or a salt thereof is added, and a predetermined time is passed. By applying a voltage and performing anodic oxidation, an electrode foil having a high capacitance is manufactured.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 遠藤 優 神奈川県藤沢市辻堂新町２丁目２番１号 エルナー株式会社内 (72)発明者 羽賀 昇 神奈川県藤沢市辻堂新町２丁目２番１号 エルナー株式会社内 (72)発明者 佐々木 幹夫 東京都千代田区丸の内２丁目１番２号 旭 硝子株式会社内 (56)参考文献 特開 平１−289107（ＪＰ，Ａ) 特開 平１−321622（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yu Endo 2-2-1 Tsujido Shinmachi, Fujisawa City, Kanagawa Elner Co., Ltd. (72) Inventor Noboru Haga 2-2-1 Tsujido Shinmachi, Fujisawa City, Kanagawa Elner Incorporated (72) Inventor Mikio Sasaki 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Asahi Glass Co., Ltd. (56) Reference JP-A-1-289107 (JP, A) JP-A-1-321622 (JP , A)

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】エッチングされたアルミニウム箔を高温の
純水中に所定時間浸漬する純水ボイル工程と、しかる後
に酒石酸またはその塩もしくはリンゴ酸またはその塩を
添加した硼酸水溶液中にそのアルミニウム箔を浸漬して
所定時間電圧を印加する陽極酸化工程とを含むことを特
徴とするアルミニウム電解コンデンサ用電極箔の製造方
法。1. A pure water boiling step of immersing an etched aluminum foil in high temperature pure water for a predetermined time, and thereafter, the aluminum foil is immersed in an aqueous boric acid solution containing tartaric acid or a salt thereof or malic acid or a salt thereof. A method of manufacturing an electrode foil for an aluminum electrolytic capacitor, comprising an anodic oxidation step of immersing and applying a voltage for a predetermined time. 【請求項２】上記硼酸水溶液中における上記酒石酸もし
くはリンゴ酸の濃度は0.002〜1.0wt％、液温は70〜100
℃である請求項１に記載のアルミニウム電解コンデンサ
用電極箔の製造方法。2. The concentration of the tartaric acid or malic acid in the aqueous boric acid solution is 0.002 to 1.0 wt%, and the liquid temperature is 70 to 100.
The method for producing an electrode foil for an aluminum electrolytic capacitor according to claim 1, which is at a temperature of ° C. 【請求項３】上記硼酸水溶液のpHは４〜９である請求項
１に記載のアルミニウム電解コンデンサ用電極箔の製造
方法。3. The method for producing an electrode foil for an aluminum electrolytic capacitor according to claim 1, wherein the pH of the aqueous boric acid solution is 4 to 9. 【請求項４】上記硼酸水溶液はその硼酸濃度が0.5〜10w
t％である請求項１に記載のアルミニウム電解コンデン
サ用電極箔の製造方法。4. The boric acid aqueous solution has a boric acid concentration of 0.5 to 10 w.
It is t%, The manufacturing method of the electrode foil for aluminum electrolytic capacitors of Claim 1. 【請求項５】請求項１に記載の陽極酸化工程後に、減極
処理、熱処理および再陽極酸化処理を少なくとも１回行
なうアルミニウム電解コンデンサ用電極箔の製造方法。5. A method for producing an electrode foil for an aluminum electrolytic capacitor, which comprises performing depolarization treatment, heat treatment and re-anodizing treatment at least once after the anodizing step according to claim 1.
JP2237625A 1990-09-07 1990-09-07 Method for manufacturing electrode foil for aluminum electrolytic capacitor Expired - Lifetime JPH0782969B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2237625A JPH0782969B2 (en) 1990-09-07 1990-09-07 Method for manufacturing electrode foil for aluminum electrolytic capacitor

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Application Number Priority Date Filing Date Title
JP2237625A JPH0782969B2 (en) 1990-09-07 1990-09-07 Method for manufacturing electrode foil for aluminum electrolytic capacitor

Publications (2)

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JPH04116911A JPH04116911A (en) 1992-04-17
JPH0782969B2 true JPH0782969B2 (en) 1995-09-06

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01289107A (en) * 1988-05-16 1989-11-21 Elna Co Ltd Manufacture of electrode foil for aluminum electrolytic condenser
JPH01321622A (en) * 1988-06-22 1989-12-27 Matsushita Electric Ind Co Ltd Manufacture of electrode foil for aluminum electrolytic capacitor

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JPH04116911A (en) 1992-04-17

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