Patent EP0336299A2 successfully refreshed from Google Patents.
EP0336299A2
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EP
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Solid electrolytic capacitor and method for manufacturing the same
Assignee: Panasonic Holdings Corp
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Filing: 1989-03-30
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Granted: —
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Expires: 2009-03-30
Abstract
Abstract The capacitor element includes a valve metal member (1) capable of forming a dielectric oxide film (2) thereon, a dielectric oxide film (3) formed on the valve metal member, an manganese oxide (4) layer formed on the dielectric oxide film (3), a conductive polymer film (5) formed on the manganese oxide film (4) by electrolytic polymerization, and terminals (2,6) formed on the valve metal member and the conductive polymer film, respectively. A method for manufacturing the solid electrolyte is also described wherein the conductive polymer film (5) is readily formed on the manganese dioxide layer (4).
Inventors
- 👤 Sohji Tsuchiya
- 👤 Yasuo Kudoh
- 👤 Toshikuni Kojima
- 👤 Masao Fukuyama
- 👤 Susumu Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 09:58
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G9/028; H01G9/15
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
A solid electrolytic capacitor which comprises a capacitor element which includes a valve metal member capable of forming a dielectric oxide film thereon, a dielectric oxide film formed on the valve metal member, an manganese dioxide layer formed on the dielectric oxide film, a conductive polymer film formed on the manganese dioxide film, and terminals formed on the valve metal member and the conductive polymer film, respectively.
Claim 2
Dependent Claim
67 words
A solid electrolytic capacitor which comprises a capacitor element which includes a valve metal member capable of forming a dielectric oxide film thereon, a dielectric oxide film formed on the valve metal member, an manganese dioxide layer formed on the dielectric oxide film, a conductive polymer film formed on the manganese dioxide film, and terminals formed on the valve metal member and the conductive polymer film, respectively.
Claim 3
Dependent Claim
27 words
The solid electrolytic capacitor according to Claim 1, wherein said valve metal member is made of a metal selected from the group consisting of aluminium and tantalum.
Claim 4
Dependent Claim
33 words
The solid electrolytic capacitor according to Claim 1, wherein said conductive polymer film is obtained by electrolytic oxidation polymerization of a monomer selected from the group consisting of pyrrole, thiophene and derivatives thereof.
Claim 5
Dependent Claim
23 words
The solid electrolytic capacitor according to Claim 1, wherein said manganese dioxide layer is in the form of islands or a continuous layer.
Claim 6
Dependent Claim
30 words
The solid electrolytic capacitor according to Claim 1, wherein one of the terminals is attached to the conductive polymer film through a conductive layer formed on said conductive polymer film.
Claim 7
Dependent Claim
30 words
The solid electrolytic capacitor according to Claim any one of the preceding claims, further comprising a non-conductive polymer film provided between the manganese dioxide layer and the conductive polymer film.
Claim 8
Dependent Claim
28 words
The solid electrolytic capacitor according to Claim 6, wherein said non-conductive polymer film is made of a polymer of an acrylic ester, a methacrylic ester, acrylonitrile or acrylamide.
Claim 9
Independent Claim
70 words
A method for manufacturing a solid electrolytic capacitor which comprises providing a valve metal member, forming an anodized film on the valve metal member, forming a manganese oxide film on the anodized film, subjecting a monomer capable of forming a conductive polymer to electrolytic polymerization thereby forming a conductive polymer film on the manganese oxide film, and attaching terminals to the valve metal member and the conductive polymer film, respectively.
Claim 10
Independent Claim
70 words
A method for manufacturing a solid electrolytic capacitor which comprises providing a valve metal member, forming an anodized film on the valve metal member, forming a manganese oxide film on the anodized film, subjecting a monomer capable of forming a conductive polymer to electrolytic polymerization thereby forming a conductive polymer film on the manganese oxide film, and attaching terminals to the valve metal member and the conductive polymer film, respectively.
Claim 11
Dependent Claim
56 words
The method according to Claim 8, wherein the anodized film-bearing valve metal member is immersed in an aqueous solution a manganese compound capable of yielding manganese dioxide by thermal treatment and thermally treating the immersed member at 200 to 350°C in air to cause manganese dioxide to be deposited on the anodized film as a layer.
Claim 12
Dependent Claim
18 words
The method according to Claim 8, wherein said manganese dioxide is formed as islands on the anodized film.
Claim 13
Dependent Claim
75 words
The method according to Claim 8, wherein said conductive polymer film is formed by immersing the valve metal member after the formation of the manganese oxide layer in an electrolytic polymerization solution comprising a monomer and a support electrolyte and applying a potential necessary for the electrolytic polymerization between at least one electrode provided in contact with the manganese dioxide layer and a counter electrode provided in the solution and separated from the first-mentioned electrode.
Claim 14
Dependent Claim
20 words
The method according to Claim 11, wherein a plurality of electrodes are provided in contact with the manganese dioxide layer.
Claim 15
Dependent Claim
17 words
The method according to Claim 8, wherein said valve metal member is made of tantalum or aluminium.
Claim 16
Dependent Claim
27 words
The method according to Claim 8, further comprising forming a non-conductive polymer film on the manganese dioxide layer prior to the formation of the conductive polymer film.
Claim 17
Dependent Claim
20 words
The method according to Claim 8, further comprising re-anodizing the anodized film after the formation of the conductive polymer film.
Claim 18
Dependent Claim
23 words
The method according to Claim 8, wherein said monomer is a member selected from the group consisting of pyrrole, thiophene and derivatives thereof.
Claim 19
Dependent Claim
40 words
The method according to Claim 8, wherein the manganese dioxide is deposited on the anodized film at a rate of 30 to 70% of a final capacitance, after which the conductive polymer film is formed on the manganese dioxide layer.
Claim 20
Dependent Claim
20 words
The method according to Claim 8, further comprising aging the capacitor by application of an appropriate potential to the terminals.
Claim 21
Dependent Claim
152 words
The method according to Claim 8, wherein said valve metal member has a positive lead electrode and at least three insulating members each having an opening through which the positive lead electrode is inserted to set the at least three insulating members at the connection of the lead electrode with the valve metal member; said anodized film is formed entirely over the valve metal member and the three insulating members; at least one insulating member is removed to expose part of the lead electrode under which the electrolytic polymerization is carried out by application of the necessary potential between the lead electrode and a counter electrode electrically separated from the lead electrode to form the conductive polymer film on the manganese dioxide layer; and removing the insulating member except for the lower most one to ensure electric insulation between the lead electrode and the conductive polymer film, thereby obtaining a capacitor element.
Claim 22
Dependent Claim
15 words
The method according to Claim 19, wherein said valve metal member is made of tantalum.
References Cited (Backward Citations)
No citation records indexed.
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