Patent ID: 7887670

Claim:
A gas introducing mechanism, which is installed in a tubular processing vessel having a side wall and a top plate for storing an object to be processed therein, and which is configured to provide a predetermined process to the object to be processed by introducing a predetermined gas into the processing vessel, the gas introducing mechanism comprising: a ring-shaped gas introducing ring member including a gas introducing port for introducing the predetermined gas from the exterior of the processing vessel, and provided at the side wall located near the top plate of the processing vessel; a disk-like rotary base rotatably provided below the top plate of the processing vessel; and a ring-shaped gas injection ring member provided around the rotary base, having an outer face opposed to an inner face of the gas introducing ring member, formed along the circumferential direction of the rotary base, and including a slit for injecting the gas, the slit extending through the gas injection ring member, from the outer face toward the inside, wherein a ring-shaped gas guide groove is provided on at least either one of the inner face of the gas introducing ring member and the outer face of the gas injection ring member, corresponding to the gas introducing port, wherein the rotary base is rotatably supported by a bearing having a sealing function, at a central portion of the top plate, and wherein the rotary base and/or gas injection ring member is supported by a side wall of the gas introducing ring member and/or the side wall of the processing vessel via a bearing.