Patent ID: 7963147

Claim:
A micro gas sensor, comprising: a vacuum cavity disposed in a substrate; a support layer having a first part covering the vacuum cavity and a second part in contact with the substrate, an upper surface of the first part being disposed at a level higher than a level at which an upper surface of the second part is disposed; a passage between the substrate and the first part of the support layer, the passage branching outwardly from an edge of the vacuum cavity, the passage having an inner end adjacent to the cavity and an outer end adjacent an outer periphery of the first part of the support layer; a sealing layer deposited to fill the passage, thereby sealing the vacuum cavity, the sealing layer being further disposed on the upper surface of the first part of the support layer and the upper surface of the second part of the support layer, the sealing layer entirely filling and closing the inner end of the passage; a micro heater disposed on the sealing layer; a plurality of electrodes insulated from the micro heater; and a gas sensitive layer covering the electrodes.