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US 5,685,964 AGranted
Oxygen concentration sensor element
AssigneeNippondenso Co., Ltd.
InventorsIsao Watanabe, Masahiro Shibata, Masaya Fujimoto
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AssigneeNippondenso Co., Ltd.
InventorsIsao Watanabe, Masahiro Shibata, Masaya Fujimoto
Estimating the term…
a limiting current type oxygen concentration sensor element includes a measured gas side electrode formed at one side of a solid electrolyte, and a diffusion resistance portion formed on the measured gas side electrode to provide diffusion resistance to passing measured gas therein. The diffusion resistance portion includes a concave portion formed at a position at least corresponding to a position of the measured gas side electrode. In the concave portion, a porous trap layer is disposed to trap contamination in measured gas. The side wall of the concave portion contacts with the trap layer. The area of a contact surface becomes larger than that without the concave portion, which can effectively prevent the trap layer from being peeled off and dropping down. The trap layer can be easily made thicker. By changing the depth of the concave portion appropriately, diffusion resistance of the diffusion resistance portion can be easily adjusted.
A limiting current type oxygen concentration sensor element comprising:
A method for manufacturing a limiting current type oxygen concentration sensor element including a solid electrolyte, a reference electrode formed at one side of said solid electrolyte, and a measured gas side electrode at the other side of said solid electrolyte, said method comprising steps of:
A method for manufacturing a limiting current type oxygen concentration sensor element including a solid electrolyte, a reference electrode formed at one side of said solid electrolyte, and a measured gas side electrode at the other side of said solid electrolyte, said method comprising:
Dependencies are inferred from the claim text.