US4305111A
Expired / Lapsed
US
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Self-healing thin-layer electrical capacitor
Assignee: Robert Bosch GmbH
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Filing: 1980-01-18
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Granted: 1981-12-08
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Expires: 2000-01-18
Abstract
Abstract To decrease the thickness of plastic foil capacitors using, for example, polycarbonate or polypropylene foils, and permit full utilization of the dielectric strength of the dielectric material without degradation of the electrode layer applied thereto, the electrode layer, typically of aluminum or zinc, has an additive of at least one of the metals Al, Ni, Mg, Ti, Hf, Be, Bi therein, present for example as an intermetallic compound, in a quantity of from 0.5 to 10%, preferably 2 to 5% (by weight). The electrode can be applied as a vapor-deposited coating, in which the additive is uniformly distributed. The previously observed decomposition of the electrode coating under applied voltages is thereby effectively prevented. Thus, the full dielectric strength of the dielectric material is utilized, resulting in a smaller and less expensive capacitor.
Inventors
- 👤 Herbert Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:15
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/015
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
Self-healing capacitor, particularly for a-c use, comprising a dielectric film or foil and an aluminum electrode coating on said dielectric, and an opposed electrode, wherein, in accordance with the invention, to prevent field-dependent degradation of the electrode coating, the aluminum electrode coating contains a uniformly distributed additive metal in a quantity of from 0.5 to 10% by weight of at least one of the metals selected from the group consisting of Ni, Mg, Ti, Hf, and Be.
Claim 2
Dependent Claim
77 words
Self-healing capacitor, particularly for a-c use, comprising a dielectric film or foil and an aluminum electrode coating on said dielectric, and an opposed electrode, wherein, in accordance with the invention, to prevent field-dependent degradation of the electrode coating, the aluminum electrode coating contains a uniformly distributed additive metal in a quantity of from 0.5 to 10% by weight of at least one of the metals selected from the group consisting of Ni, Mg, Ti, Hf, and Be.
Claim 3
Dependent Claim
41 words
Capacitor according to claim 1 wherein said additive metals are primarily present in the form of an intermetallic compound with the aluminum and wherein the aluminum electrode coating layer is in a thickness of about at least 6 μg/cm 2 .
Claim 4
Dependent Claim
20 words
Capacitor according to claim 1 or 2 wherein said additive metal is present in an amount between 2 and 5%.
Claim 5
Dependent Claim
11 words
Capacitor according to claim 3 wherein said additive metal is magnesium.
Claim 6
Dependent Claim
13 words
Capacitor according to claim 1 or 2 wherein said additive metal is magnesium.
Claim 7
Dependent Claim
65 words
Capacitor according to claim 1 or 2 wherein the film or foil comprises at least one selected from the group consisting of polypropylene and polycarbonate; and has, for nominal a-c operating voltages, at power frequencies, thicknesses as given below: up to 320 V, thickness to 6 μm, 400 to 500 V, thickness 8 μm, voltages over 500 V to 600 V, thickness to 9 μm.
Claim 8
Dependent Claim
63 words
Capacitor according to claim 4 wherein the film or foil comprises at least one selected from the group consisting of polypropylene and polycarbonate; and has, for nominal a-c operating voltages, at power frequencies, thicknesses as given below: up to 320 V, thickness to 6 μm, 400 to 500 V, thickness 8 μm, voltages over 500 V to 600 V, thickness to 9 μm.
Claim 9
Dependent Claim
63 words
Capacitor according to claim 5 wherein the film or foil comprises at least one selected from the group consisting of polypropylene and polycarbonate; and has, for nominal a-c operating voltages, at power frequencies, thicknesses as given below: up to 320 V, thickness to 6 μm, 400 to 500 V, thickness 8 μm, voltages over 500 V to 600 V, thickness to 9 μm.
Claim 10
Dependent Claim
97 words
Self-healing capacitor, particularly for a-c use, comprising a dielectric film or foil and a zinc electrode coating on said dielectric, and an opposed electrode, wherein, in accordance with the invention, to prevent field-dependent degradation of the electrode coating, the zinc electrode coating contains a uniformly distributed additive metal in a quantity of from 0.5 to 10% by weight of at least one of the metals of the group consisting of Al, Ni, Mg, Ti, Hf, and Be, and wherein said additive metal is primarily present in the form of an intermetallic compound with the zinc electrode layer.
Claim 11
Dependent Claim
97 words
Self-healing capacitor, particularly for a-c use, comprising a dielectric film or foil and a zinc electrode coating on said dielectric, and an opposed electrode, wherein, in accordance with the invention, to prevent field-dependent degradation of the electrode coating, the zinc electrode coating contains a uniformly distributed additive metal in a quantity of from 0.5 to 10% by weight of at least one of the metals of the group consisting of Al, Ni, Mg, Ti, Hf, and Be, and wherein said additive metal is primarily present in the form of an intermetallic compound with the zinc electrode layer.
Claim 12
Dependent Claim
36 words
Capacitor according to claim 9 wherein said zinc electrode coating layer is in an amount about at least 8 μm/cm 2 , and wherein said additive metal is in an amount of between 2 and 5%.
Claim 13
Dependent Claim
65 words
Capacitor according to claim 9 or 10 wherein the film or foil comprises at least one selected from the group consisting of polypropylene and polycarbonate; and has, for nominal a-c operating voltages, at power frequencies, thicknesses as given below: up to 320 V, thickness to 6 μm, 400 to 500 V, thickness 8 μm, voltages over 500 V to 600 V, thickness to 9 μm.
Claim 14
Dependent Claim
21 words
Capacitor according to claim 10 wherein said additive is magnesium and is present in an amount between about 2 and 5%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |