Patent ID: 7674336

Claim:
A longitudinal type of thermal processing apparatus comprising: a processing container made of quartz, having an opening part at a lower end thereof, a lid provided under the opening part, capable of moving up and down so as to open and close the opening part, a holder provided on the lid, capable of hold a plurality of objects to be processed in a tier-like manner, and a heating unit provided around the processing container, wherein the lid has an inner lid part made of quartz that comes in contact with a lower-end surface of the opening part, and an outer lid part made of a metal that covers an outside surface of the inner lid part, the lower-end surface of the opening part and an upper-end surface of the inner lid part, which come in contact with each other, are mirror-finished, a first flange is provided at an outside periphery of the opening part, the first flange is located higher than the lower-end surface of the opening part, a second flange is provided at an outside periphery of the inner lid part, the second flange is located lower than the upper-end surface of the inner lid part, a flange holder is provided between the first flange and the second flange, and a channel for vacuuming is formed by: an inner surface of the flange holder, a lower surface of the first flange, an upper surface of the second flange, an outer surface of the inner lid part from the second flange to the upper-end surface, and an outer surface of the opening part from the lower-end surface to the first flange.