Appeal No. 1999-0555
Application No. 08/593,330
drawing, the detector includes an outer electrode 23, a heater
31, a protecting cover 16 having first and second levels of
multiple openings 161 and 162 and wherein the relationship
between the length L of the heat generating part of the heater
1
and the distance L between the first and second levels of
2
multiple openings is such that 0.9 is less than or equal to
L /L which in turn is less than or equal to 1.3. Further
1 2
details of this appealed subject matter are set forth in
representative independent claim 1 which reads as follows:
1. An oxygen concentration detector comprising:
a) an oxygen concentration sensing element
comprised of a solid electrolyte and an outer electrode
provided on the external surface of said solid
electrolyte for contributing to detecting the
concentration of oxygen in a gas to be measured;
b) a heater disposed near said solid electrolyte
for heating said solid electrolyte, said outer electrode
being located within the range defined by the length of
the heat-generating part of said heater, in the direction
of the length of said sensing element; and
c) a protecting cover separated from said sensing
element and extending to cover its exterior for
protecting said sensing element, said protecting cover
having a first level and a second level of multiple
openings in the lengthwise direction, said first and
second levels of multiple openings being located outside
of the range corresponding to said outer electrode in the
direction of the length of said sensing element, there
being no openings in said protecting cover in the range
2
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