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US 2014/0190828 A1Published application
Gas sensor element and gas sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsKentaro KAMADA, Masaki NAKAGAWA, Koji SHIOTANI
Life of this patent
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Abstract
A first electrode (133) has an exposure portion (133b) exposed to a second measuring chamber (160), and a connection portion (133d) which is disposed at a position not exposed to the second measuring chamber (160) and is connected to the first lead (137) and which is a portion of the first electrode (133) located most distant from the second measuring chamber (160). The entire connection portion (133d) is located in a region A1 which extends from the second measuring chamber (160) over a distance of 1.0 mm or less.
Claims7
A gas sensor element comprising:
- a platelike solid electrolyte body having oxygen ion conductivity;
- an oxygen-permeable first electrode provided on a front or back surface of the solid electrolyte body;
- an oxygen-impermeable first lead connected to the first electrode;
- an oxygen-permeable second electrode provided on the front or back surface of the solid electrolyte body;
- and
- a measuring chamber which is disposed in opposition to the first electrode and into which gas to be measured is introduced;
- and
- configured such that oxygen ions stemming from NOx contained in the gas-to-be-measured introduced into the measuring chamber move from the measuring chamber to a destination located externally of the measuring chamber through the solid electrolyte body, whereby a current corresponding to the concentration of oxygen stemming from the NOx flows between the first electrode and the second electrode;
- wherein
- the first electrode has an exposure portion exposed to the measuring chamber, and a connection portion which is disposed at a position not exposed to the measuring chamber and is connected to the first lead and which is a portion of the first electrode located most distant from the measuring chamber, and
- the entire connection portion is located in a region which extends from the measuring chamber over a distance of 1.0 mm or less.
8 more elements
A gas sensor element comprising:
- a platelike solid electrolyte body having oxygen ion conductivity;
- an oxygen-permeable first electrode provided on a front or back surface of the solid electrolyte body;
- an oxygen-impermeable first lead connected to the first electrode;
- an oxygen-permeable second electrode provided on the front or back surface of the solid electrolyte body;
- and
- a measuring chamber which is disposed in opposition to the first electrode and into which gas to be measured is introduced;
- and
- configured such that oxygen ions stemming from NOx contained in the gas-to-be-measured introduced into the measuring chamber move from the measuring chamber to a destination located externally of the measuring chamber through the solid electrolyte body, whereby a current corresponding to the concentration of oxygen stemming from the NOx flows between the first electrode and the second electrode;
- wherein
- the first electrode is disposed within the measuring chamber;
- the gas sensor element further comprises an insulation layer formed on the front or back surface of the solid electrolyte body;
- the first lead and a portion of the first electrode are formed on the insulation layer;
- and
- the first electrode has a contact portion which is in contact with the solid electrolyte body through a through hole extending through the insulation layer, and a connection portion connected to the first lead on the insulation layer within the measuring chamber.
11 more elements
Dependencies are inferred from the claim text.