Patent ID: 7211222
Filing Date: 2007-05-01
Classification: G01N,Y10T

Abstract:
1. A gas sensor comprising: a housing; a gas sensing element disposed in said housing; a powder filler stuffed in a filler space defined between said housing and said gas sensing element so as to airtightly seal a clearance between said housing and said gas sensing element, wherein said powder filler contains grains whose diameter is in a range from 80 μm to 5,000 μm when measured before being stuffed into said filler space, and a weight percentage of said grains having the diameter of 80 μm to 5,000 μm is equal to or larger than 80% with respect to an overall weight of said powder filler; an outside electrode disposed on a surface of said gas sensing element; an electrode protecting layer provided on the surface of said gas sensing element so as to cover and protect said outside electrode; and an uneven surficial layer for enhancing adhesion of said outside electrode to said electrode protecting layer and holding said outside electrode on the surface of said gas sensing element, wherein proximal ends of said uneven surficial layer and the electrode protecting layer are offset toward a distal end side of said gas sensor with respect to said proximal end of said filler space, and wherein said outside electrode extends toward a proximal end side of said gas sensor with respect to said proximal end of said filler space.