Appeal No. 2000-1075
Application 08/838,910
illustrative:
21. An oxygen concentration detector comprising:
a sensor element including a solid electrolyte and external
and internal electrodes provided on external and internal
surfaces thereof, respectively;
a high-emissivity layer provided on a surface of said
internal electrode; and
a heater disposed adjacent to said high-emissivity layer to
form a clearance therebetween, the clearance being 0.1 mm or
more, wherein:
said internal electrode has an emissivity less than that of
said high-emissivity layer; and
said high-emissivity layer has an emissivity of 0.3 or more,
and a porosity more than 10 percent.
32. An oxygen concentration detector comprising:
a sensor element including a solid electrolyte and external
and internal electrodes provided on external and internal
surfaces thereof, respectively; and
a heater disposed adjacent to said internal electrode to
form a clearance therebetween, the clearance being 0.1 mm or
more;
wherein said heater has an emissivity of 0.6 or more.
THE REFERENCES
Pollner et al. (Pollner) 4,021,326 May 3, 1977
Torisu et al. (Torisu) 4,452,687 Jun. 5, 1984
Sakurai et al. (Sakurai) 4,540,479 Sep. 10, 1985
Ker et al. (Ker) 4,900,412 Feb. 13, 1990
Agarwal et al. (Agarwal) 4,935,118 Jun. 19, 1990
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