JPS62259419A - Aluminum electrolytic capacitor - Google Patents
Aluminum electrolytic capacitorInfo
- Publication number
- JPS62259419A JPS62259419A JP10233086A JP10233086A JPS62259419A JP S62259419 A JPS62259419 A JP S62259419A JP 10233086 A JP10233086 A JP 10233086A JP 10233086 A JP10233086 A JP 10233086A JP S62259419 A JPS62259419 A JP S62259419A
- Authority
- JP
- Japan
- Prior art keywords
- foil
- anodic oxide
- oxide film
- electrolytic capacitor
- aluminum
- 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 title claims description 19
- 229910052782 aluminium Inorganic materials 0.000 title claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 16
- 239000011888 foil Substances 0.000 claims description 23
- 239000010407 anodic oxide Substances 0.000 claims description 15
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000007743 anodising Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- 238000002048 anodisation reaction Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- VYQNWZOUAUKGHI-UHFFFAOYSA-N monobenzone Chemical compound C1=CC(O)=CC=C1OCC1=CC=CC=C1 VYQNWZOUAUKGHI-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000000866 electrolytic etching Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、各種電子機器に用いられるアルミ電解コンデ
ンサに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to aluminum electrolytic capacitors used in various electronic devices.
従来の技術
従来、アルミ電解コンデンサは、電解エツチングを行い
実効表面積を拡大した電極箔の表面に、化成処理により
誘電体皮膜を形成し、セパレータとともに巻回して駆動
用電解液を含浸して構成していた。Conventional technology Conventionally, aluminum electrolytic capacitors are constructed by forming a dielectric film by chemical conversion treatment on the surface of electrode foil whose effective surface area has been expanded by electrolytic etching, and then winding it together with a separator and impregnating it with a driving electrolyte. was.
誘電体皮膜を形成する方法としては、中性水溶液中での
陽極酸化が一般的であり、化成液としてはホウ酸塩、リ
ン酸塩、アジピン酸塩等が用いられている。A common method for forming a dielectric film is anodic oxidation in a neutral aqueous solution, and borate, phosphate, adipate, etc. are used as the chemical solution.
ところで化成されたアルミニウム箔は、リード線をかし
め、あるいは圧接した後、セパレータと共に巻回され、
電解コンデンサとして組立てられる。By the way, the chemically formed aluminum foil is wound together with a separator after the lead wires are caulked or pressed together.
Assembled as an electrolytic capacitor.
リード線のかしめ時、あるいは電極箔がまきとられる際
には、誘電体皮膜の表面に機械的ストレスがかかり、誘
電体皮膜にクラック（ひび割れ）が入り、もれ電流の増
大をまねく場合がある。When the lead wire is caulked or the electrode foil is rolled up, mechanical stress is applied to the surface of the dielectric film, which may cause cracks in the dielectric film and lead to an increase in leakage current. .
この問題を防ぐために、従来は誘電体皮膜の表面に多孔
質状陽極酸化皮膜を形成し、誘電体皮膜を保護する保護
膜を形成する方法が採用されている○
発明が解決しようとする問題点
このような従来の方法による多孔質状陽極酸化皮膜によ
る保護膜では、皮膜硬さが、ヴイッカース硬度で１５０
（Ｈｖ）以下であり、強度的に不十分であり、耐摩耗性
にも限界があった。その結果、コンデンサ組立時に誘電
体皮膜にひび割れが生じ、もれ電流の劣化を起こすとい
う欠点があった。In order to prevent this problem, conventionally a method has been adopted in which a porous anodic oxide film is formed on the surface of the dielectric film to form a protective film to protect the dielectric film. ○ Problems that the invention aims to solve In the case of a protective film made of a porous anodic oxide film formed by such a conventional method, the film hardness is 150 on the Vickers hardness.
(Hv) or less, the strength was insufficient, and the wear resistance was also limited. As a result, cracks occur in the dielectric film during capacitor assembly, resulting in deterioration of leakage current.
問題点を解決するための手段
このような上記間顕点を解決するために、本発明はシュ
ウ酸あるいは硫酸水溶液中で液温０〜２０’Ｃ，電流密
度６〜１０ム／ｄ ｍ２で陽極酸化した硬質陽極酸化皮
膜を誘電体皮膜の保護膜として用いた電極箔をアルミ電
解コンデンサの陽極箔として用いるというものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an anode in an oxalic acid or sulfuric acid aqueous solution at a liquid temperature of 0 to 20'C and a current density of 6 to 10 m/d m2. An electrode foil using an oxidized hard anodic oxide film as a protective film for a dielectric film is used as an anode foil for an aluminum electrolytic capacitor.
作用 この技術的手段による作用は次のようになる。action The effect of this technical means is as follows.
従来の普通陽極酸化法によるアルマイト皮膜は、ヴイソ
カース硬度が１５０（Ｈｖ）程度であるが、硬質陽極酸
化皮膜は３５０〜４５０（Ｈｖ）と約３〜４倍に皮膜硬
度が向上する。The alumite film formed by the conventional ordinary anodizing method has a Visocurs hardness of about 150 (Hv), but the hard anodic oxide film has a hardness of 350 to 450 (Hv), which is about 3 to 4 times higher.
その結果、電解コンデンサ組立時に生ずる機械的ストレ
スに対しての保護作用が向上するのである０
実施例
以下、本発明の実施例を図面を用いて説明する。As a result, the protection effect against mechanical stress generated when assembling an electrolytic capacitor is improved.Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
まず、第１図において、１はアルミニウムなどの金属よ
りなる有底筒状のケースであり、このケース１にはコン
デンサ素子２と駆動用電解液が収納され、封口体３をケ
ース１の開口端に封着してアルば電解コンデンサとして
いる。First, in FIG. 1, 1 is a bottomed cylindrical case made of metal such as aluminum, and this case 1 houses a capacitor element 2 and a driving electrolyte. It is sealed to form an electrolytic capacitor.
そして、上記コンデンサ素子２としては、第２図に示す
ように表面積を拡大したアルミニウム箔４の表面に誘電
体皮膜５を設け、この誘電体皮膜５上に硬質陽極酸化皮
膜６を設けた陽極箔７とアルミニウム箔よりなる陰極箔
８とをセパレータ９を介して巻回し、上記陽極箔７．陰
極箔８からは引出しリード線１０が引出され、上述の封
口体３を貫通して外部に引出されている。As shown in FIG. 2, the capacitor element 2 is an anode foil in which a dielectric film 5 is provided on the surface of an aluminum foil 4 with an enlarged surface area, and a hard anodic oxide film 6 is provided on the dielectric film 5. 7 and a cathode foil 8 made of aluminum foil are wound together with a separator 9 in between. A lead wire 10 is drawn out from the cathode foil 8, passes through the above-mentioned sealing body 3, and is drawn out to the outside.
上記陽極箔７は、アルミニウム箔４に表面積拡大のため
のエツチング処理を施した後、シュウ酸あるいは硫酸５
チ〜１０％の水溶液の化成液を用い、液温０〜２ｏ℃、
電流密度５〜１０ム／ｄｍ２で陽極化成を行って硬質陽
極酸化皮膜６を形成し、次いでホウ酸５チの水溶液中で
陽極化成を行って硬質陽極酸化皮膜６の下層に誘電体皮
膜５を形成させて得ることができる。The anode foil 7 is made by etching the aluminum foil 4 to increase its surface area and then etching it with oxalic acid or sulfuric acid.
Using a chemical solution of H to 10% aqueous solution, the liquid temperature is 0 to 2oC,
Anodization is performed at a current density of 5 to 10 μm/dm2 to form a hard anodic oxide film 6, and then anodization is performed in an aqueous solution of 5% boric acid to form a dielectric film 5 on the lower layer of the hard anodic oxide film 6. It can be obtained by forming
普通陽極酸化皮膜と硬質陽極酸化皮膜の化成条件は以下
の通りである。The chemical formation conditions for the normal anodic oxide film and the hard anodic oxide film are as follows.
アルミニウム箔に、これらの陽極酸化皮膜を形成した後
に、ホウ酸塩水溶液で誘電体皮膜５を形成し、陽極箔γ
を作成する。これらの陽極箔７を用いてアルば電解コン
デンサを組立てた後、もれ電流値を測定した。After forming these anodic oxide films on the aluminum foil, a dielectric film 5 is formed using a borate aqueous solution, and the anode foil γ
Create. After assembling an Alba electrolytic capacitor using these anode foils 7, the leakage current value was measured.
（２５０Ｖ ２００μＦ）
ただし普通アルマイトは普通陽極酸化皮膜のことであシ
、硬質アルマイトは硬質陽極酸化皮膜のことである。(250V 200μF) However, normal alumite refers to a normal anodic oxide film, and hard alumite refers to a hard anodic oxide film.
このように本発明により、もれ電流が低減されることが
わかる。As described above, it can be seen that the present invention reduces leakage current.
発明の効果
以上のように、本発明によれば、アルミ電解コンデンサ
のもれ電流を低減することができ、品質の向上が得られ
るという効果がある。Effects of the Invention As described above, according to the present invention, leakage current of an aluminum electrolytic capacitor can be reduced and quality can be improved.
第１図は本発明のアルば電解コンデンサの一実施例を示
す分解斜視図、第２図は同コンデンサの陽極箔の要部拡
大断面図である。
１・・・・・・ケース、２・・・・・・コンデンサ素子
、３・・・・・・封口体、４・・・・・・アルｉニウム
箔、６・・・・・・誘電体皮膜、６・・・・・・硬質陽
極酸化皮膜、７・・・・・・陽極箔、８・・・・・・陰
極箔、９・・・・・・セパレータ、１ｏ・・・・・・引
出しリード線。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第 ２ 図
七方暇Ｗ矢FIG. 1 is an exploded perspective view showing one embodiment of the Alba electrolytic capacitor of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the anode foil of the same capacitor. 1... Case, 2... Capacitor element, 3... Sealing body, 4... Aluminum foil, 6... Dielectric material Film, 6... Hard anodic oxide film, 7... Anode foil, 8... Cathode foil, 9... Separator, 1o... Drawer lead wire. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 7-way leisure W arrow
Claims (2)
アルミニウム箔を陽極箔としセパレータを介して陰極箔
とともに巻回したコンデンサ素子を電解液とともにケー
スに封入してなるアルミ電解コンデンサ。(1) An aluminum electrolytic capacitor in which an aluminum foil with a hard anodic oxide film formed on the surface of a dielectric film is used as an anode foil, and a capacitor element is wound together with a cathode foil via a separator, and the capacitor element is enclosed in a case together with an electrolyte.
を、液温０〜２０℃、電流密度５〜１０Ａ／ｄで陽極酸
化して得られた硬質陽極酸化皮膜を用いることを特徴と
する特許請求の範囲第１項記載のアルミ電解コンデンサ
。(2) A patent claim characterized in that a hard anodic oxide film obtained by anodizing aluminum foil in a sulfuric acid or oxalic acid aqueous solution at a liquid temperature of 0 to 20°C and a current density of 5 to 10 A/d is used. Aluminum electrolytic capacitors described in scope 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10233086A JPS62259419A (en) | 1986-05-02 | 1986-05-02 | Aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10233086A JPS62259419A (en) | 1986-05-02 | 1986-05-02 | Aluminum electrolytic capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62259419A true JPS62259419A (en) | 1987-11-11 |
Family
ID=14324517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10233086A Pending JPS62259419A (en) | 1986-05-02 | 1986-05-02 | Aluminum electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62259419A (en) |
-
1986
- 1986-05-02 JP JP10233086A patent/JPS62259419A/en active Pending
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