EP0134709A1
Expired / Lapsed
EP
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An oxygen sensor element
Assignee: NGK Insulators Ltd
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Filing: 1984-08-09
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Granted: —
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Expires: 2004-08-09
Abstract
Abstract An oxygen sensor element has measuring and reference electrodes 3,4 in contact with solid electrolyte material 2,9. To reduce stress in the electrolyte due to differences of thermal expansion or firing shrinkage, the measuring electrode 3 is mounted on one side surface of a first solid electrolyte 2, while the reference electrode 4 is mounted on a separate solid electrolyte 9 and disposed so as to face the other side surface of said first solid electrolyte 2 across a gap. An intermediate electrolyte layer 8 may be provided and the said gap may be filled with porous electrolyte 7'. A heater, comprising ceramics layers 10 and 13 and a heating element 11, may contact the second electrolyte 9 directly, to improve heat transmission to the reference electrode.
Inventors
- 👤 Syunzo 435 Aza-Motokinogo Mase
- 👤 Shigeo 25-70 Jiami Soejima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4071; G01N27/4067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
An oxygen sensor element, comprising a first planar solid electrolyte having a measuring electrode mounted on one side surface thereof, a second planar solid electrolyte in tight contact with that surface of the first planar electrolyte which is opposite to said measuring electrode, said second planar solid electrolyte having a gap portion adjacent said first planar solid electrolyte, said gap portion carrying a reference substance, and a reference electrode mounted on surface of said second planar solid electrolyte at a position facing said first planar solid electrolyte across said gap portion.
Claim 2
Dependent Claim
91 words
An oxygen sensor element, comprising a first planar solid electrolyte having a measuring electrode mounted on one side surface thereof, a second planar solid electrolyte in tight contact with that surface of the first planar electrolyte which is opposite to said measuring electrode, said second planar solid electrolyte having a gap portion adjacent said first planar solid electrolyte, said gap portion carrying a reference substance, and a reference electrode mounted on surface of said second planar solid electrolyte at a position facing said first planar solid electrolyte across said gap portion.
Claim 3
Dependent Claim
113 words
An oxygen sensor element, comprising a first planar solid electrolyte having a measuring electrode mounted on one side surface thereof, a second planar solid electrolyte in tight contact with that surface of the first planar electrolyte which is opposite to said measuring electrode, said second planar solid electrolyte having a gap portion adjacent said first planar solid electrolyte, said gap portion carrying a reference substance, a reference electrode mounted on surface of said second planar solid electrolyte at a position facing said first planar solid electrolyte across said gap portion, and a heater disposed in tight contact with surface of said second planar solid electrolyte at a position separated from said reference electrode.
Claim 4
Dependent Claim
113 words
An oxygen sensor element, comprising a first planar solid electrolyte having a measuring electrode mounted on one side surface thereof, a second planar solid electrolyte in tight contact with that surface of the first planar electrolyte which is opposite to said measuring electrode, said second planar solid electrolyte having a gap portion adjacent said first planar solid electrolyte, said gap portion carrying a reference substance, a reference electrode mounted on surface of said second planar solid electrolyte at a position facing said first planar solid electrolyte across said gap portion, and a heater disposed in tight contact with surface of said second planar solid electrolyte at a position separated from said reference electrode.
Claim 5
Dependent Claim
37 words
An oxygen sensor element as set forth in claim 2, wherein said heater is a ceramic heater disposed in tight contact with that surface of said second planar solid electrolyte which does not carry said reference electrode.
Claim 6
Dependent Claim
24 words
An oxygen sensor element as set forth in claim 1, 2, or 3 and further comprising a porous ceramics fitted in said gap portion.
Claim 7
Dependent Claim
25 words
An oxygen sensor element as set forth in claim 1, 2, or 3 and further comprising a porous solid electrolyte fitted in said gap portion.
References Cited (Backward Citations)
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