US4096048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor and manufacturing method thereof
Assignee: Toyota Motor Corp
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Filing: 1977-06-09
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Granted: 1978-06-20
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Expires: 1997-06-09
Abstract
Abstract An oxygen sensor consisting of a metal electrode formed on the surface of the side to be measured of a solid electrolyte sintering and of a reference oxygen pole formed by a mixture of metal and metal oxide on the opposite side of said surface of the side to be measured of the solid electrolyte sintering body, characterized in that, at least over the whole surface adjoining the mixture of metal and metal oxide on the side of the reference oxygen pole of the solid electrolyte sintering, a porous metal electrode is formed to insulate the solid electrolyte sintering from the mixture of metal and metal oxide, thereby improving the low temperature performance and internal impedance characteristics, as well as prolonging the life thereof. A method for manufacturing this sensor is also provided.
Inventors
- 👤 Shinichi Matsumoto
- 👤 Hirohisa Miura
- 👤 Kiyoshi Uchida
- 👤 Yasuhiro Otsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:19
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; G01N27/4076; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
An oxygen sensor comprising: a solid electrolyte sintering of an oxygen ion-conductive ceramic material; a metal electrode formed on the measured side of said solid electrolyte sintering; a reference oxygen pole of a mixture of metal and metal oxide charged on the opposite side of said solid electrolyte sintering; a metal electrode formed on the side of said reference oxygen pole covering at least the total area of said solid electrolyte sintering which adjoins said reference oxygen pole, said metal electrode serving to insulate said reference oxygen pole from said solid electrolyte sintering; a holder to support said solid electrolyte; and a means to take out the outputs of said two metal electrodes.
Claim 2
Dependent Claim
113 words
An oxygen sensor comprising: a solid electrolyte sintering of an oxygen ion-conductive ceramic material; a metal electrode formed on the measured side of said solid electrolyte sintering; a reference oxygen pole of a mixture of metal and metal oxide charged on the opposite side of said solid electrolyte sintering; a metal electrode formed on the side of said reference oxygen pole covering at least the total area of said solid electrolyte sintering which adjoins said reference oxygen pole, said metal electrode serving to insulate said reference oxygen pole from said solid electrolyte sintering; a holder to support said solid electrolyte; and a means to take out the outputs of said two metal electrodes.
Claim 3
Dependent Claim
35 words
An oxygen sensor as set forth in claim 1, wherein a porous coating layer of inorganic substance is provided, covering the metal electrode, on the surface of the measured side of said solid electrolyte sintering.
Claim 4
Dependent Claim
21 words
An oxygen sensor as set forth in claim 2, wherein said porous coating layer is 5 μ ˜ 250 μ thick.
Claim 5
Dependent Claim
43 words
An oxygen sensor as set forth in claim 1, wherein said solid electrolyte sintering is formed like a vessel and a heat-resistant inorganic substance, charged and sintered, is provided at the vessel opening side of said reference oxygen pole charged into said vessel.
Claim 6
Dependent Claim
39 words
An oxygen sensor as set forth in claim 1, wherein the metal electrode on the side of the reference oxygen pole and the metal electrode on the side of measured system are respectively 0.5 μ ˜ 20 μ thick.
Claim 7
Dependent Claim
52 words
An oxygen sensor as set forth in claim 1, wherein said solid electrolyte is a composition of at least one from among the group consisting of ZrO 2 , H 5 O 2 and CeO 2 and at least one from the group of CaO, MgO, and Y 2 O 3 .
Claim 8
Dependent Claim
53 words
An oxygen sensor as set forth in claim 1, wherein the metal electrode on the side of the reference oxygen pole and the metal electrode on the side of the measured system are, respectively, made of Pt alone or a combination of Pt and at least one from among Pd, Au and Rh.
Claim 9
Dependent Claim
29 words
An oxygen sensor as set forth in claim 1, wherein said reference oxygen pole is constituted of one from among the group consisting of Ni/NiO, Cu/CuO, Co/CoO and Fe/FeO.
Claim 10
Dependent Claim
104 words
A manufacturing method of an oxygen sensor, comprising the steps of: forming a solid electrolyte sintering of an oxygen ion-conductive inorganic substance; forming a metal electrode on each side of said solid electrolyte sintering by electric plating or by pasting; forming a reference oxygen pole by charging and sintering a mixture of metal and metal oxide on one part of the solid electrolyte in such a manner that said oxygen pole may be insulated by said metal electrode from said solid electrolyte sintering; and assembling said solid electrolyte sintering with a holder and a means to take out the outputs of both metal electrodes.
Claim 11
Dependent Claim
104 words
A manufacturing method of an oxygen sensor, comprising the steps of: forming a solid electrolyte sintering of an oxygen ion-conductive inorganic substance; forming a metal electrode on each side of said solid electrolyte sintering by electric plating or by pasting; forming a reference oxygen pole by charging and sintering a mixture of metal and metal oxide on one part of the solid electrolyte in such a manner that said oxygen pole may be insulated by said metal electrode from said solid electrolyte sintering; and assembling said solid electrolyte sintering with a holder and a means to take out the outputs of both metal electrodes.
Claim 12
Dependent Claim
41 words
A manufacturing method as set forth in claim 9, further comprising the step of forming a porous coating layer, by plasma metallization of an inorganic substance, on the metal electrode opposite to the reference oxygen pole of said solid electrolyte sintering.
Claim 13
Dependent Claim
50 words
A manufacturing method as set forth in claim 9, wherein said solid electrolyte sintering is formed like a vessel, said reference oxygen pole is charged and sintered in said vessel, and then a heat-resistant inorganic substance is charged and sintered at the vessel opening side of said reference oxygen pole.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |