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US5428500A
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Solid electrolytic capacitor
Assignee: Tokin Corp
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Filing: 1994-11-14
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Granted: 1995-06-27
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Expires: 2014-11-14
Abstract
Abstract A solid electrolytic capacitor includes an anode, a dielectric layer, a solid electrolyte layer, and a cathode electrode. The solid electrolyte layer consists of a conductive polymer compound obtained by doping a dopant in one of a copolymer and a mixture of polypyrrole or a derivative thereof, the polypyrrole having a repetition unit represented by a formula ##STR1## wherein each of R 1 to R 3 represents an alkyl group or a hydrogen atom, and polyaniline or a derivative thereof, the polyaniline having a repetition unit represented by a formula ##STR2## wherein each of R 4 to R 7 represents an alkyl group or a hydrogen atom.
Inventors
- 👤 Toshihiko Nishiyama
- 👤 Koji Sakata
- 👤 Takashi Fukaumi
- 👤 Atsushi Kobayashi
- 👤 Satoshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:08
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G11/00; H01G11/22; H01G11/30; H01G11/48; H01G11/54; H01G11/56; H01G9/028; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A solid electrolytic capacitor comprising: an anode consisting of a valve metal and having a lead extending therefrom; a dielectric layer constituted by an oxide coating formed by oxidizing a surface of said anode; a solid electrolyte layer formed on said dielectric layer; and a cathode electrode formed on said solid electrolyte layer, wherein said solid electrolyte layer consists of a conductive polymer compound obtained by doping a dopant in one of a copolymer and a mixture of polypyrrole or a derivative thereof, the polypyrrole having a repetition unit represented by a formula ##STR5## wherein each of R 1 to R 3 represents an alkyl group or a hydrogen atom, and polyaniline or a derivative thereof, the polyaniline having a repetition unit represented by a formula ##STR6## wherein each of R 4 to R 7 represents an alkyl group or a hydrogen atom.
Claim 2
Dependent Claim
143 words
A solid electrolytic capacitor comprising: an anode consisting of a valve metal and having a lead extending therefrom; a dielectric layer constituted by an oxide coating formed by oxidizing a surface of said anode; a solid electrolyte layer formed on said dielectric layer; and a cathode electrode formed on said solid electrolyte layer, wherein said solid electrolyte layer consists of a conductive polymer compound obtained by doping a dopant in one of a copolymer and a mixture of polypyrrole or a derivative thereof, the polypyrrole having a repetition unit represented by a formula ##STR5## wherein each of R 1 to R 3 represents an alkyl group or a hydrogen atom, and polyaniline or a derivative thereof, the polyaniline having a repetition unit represented by a formula ##STR6## wherein each of R 4 to R 7 represents an alkyl group or a hydrogen atom.
Claim 3
Dependent Claim
48 words
A capacitor according to claim 1, wherein said solid electrolyte layer is constituted by a conductive polymer compound layer formed by a chemical oxidation and polymerization process, and said conductive polymer compound layer having a predetermined thickness is formed by repeatedly performing the chemical oxidation and polymerization process.
Claim 4
Dependent Claim
41 words
A capacitor according to claim 1, wherein the anode having said dielectric layer formed on a surface thereof is dipped in a solution mixture of pyrrole and aniline and then dipped in an oxidant solution, thereby forming said solid electrolyte layer.
Claim 5
Dependent Claim
76 words
A capacitor according to claim 1, wherein, after said anode having said dielectric layer formed on a surface thereof is dipped in a solution mixture which is obtained by mixing a solution mixture of pyrrole and aniline with an oxidant solution and has a temperature kept lower than a temperature at which a polymerization reaction progresses, the polymerization reaction is caused to progress in an atmosphere at a predetermined temperature, thereby forming the solid electrolyte layer.
Claim 6
Dependent Claim
44 words
A capacitor according to claim 1, wherein said anode consists of a tantalum sintered body formed by sintering a tantalum powder, and said dielectric layer is constituted by a tantalum oxide coating formed on said tantalum sintered body by anodizing said tantalum sintered body.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |