Patent ID: 8747555

Claim:
A deposition apparatus comprising: a vacuum tank: a lid body closing an upper portion of the vacuum tank; a stage for supporting a substrate to be processed; a gas head mounted to the lid body such that the gas head is opposed to the stage; and an inner block disposed between the vacuum tank and the lid body and including a built-in heating source, the inner block determining a volume of a reaction space between the stage and the gas head, wherein the inner block includes a plurality of annular block bodies each having a different inner diameter, wherein a first body of the plurality of annular block bodies mates against the vacuum tank, a second body of the plurality of annular block bodies includes a flange that bears on the first body, and a third body of the plurality of annular block bodies includes a flange that bears on the second body, and wherein the annular bodies are attached and detached to vary the volume of the reaction space.