Gas sensor
AssigneeKoa Corporation
InventorsTetsuro Tanaka, Kenichi Iguchi, Ken Takahashi, Chika Ito
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Abstract
A sensor element (12) has a cross-sectional area that continuously only increases from a positive (+) electrode side toward a negative (−) electrode side, thereby leading a hot spot, which attempts to move to the negative electrode side, to a lower resistance side. A position that is at nearly equal distances from paired electrodes (13 and 15) formed on either end of the sensor element (12) is set as a hot spot generating position, so as to avoid damage to the electrodes due to heat emitted by the hot spot.
Claims7
A gas sensor made from a ceramic sintered body for detecting a gas concentration, either change in an electric current value or change in a resistance value measured when a voltage is applied to a sensor element, wherein
- the sensor element has a shape in which a cross-sectional area changes from one electrode side toward the other electrode side of paired electrode parts formed on either longitudinal end, where the cross-sectional area continuously only increases or continuously only decreases from the one electrode side toward the other electrode side.
Dependencies are inferred from the claim text.