Patent ID: 7618493

Claim:
A thin film-manufacturing device serving as a CVD device in which a film-forming gas is introduced into a reaction chamber from an upper portion of the chamber serving as a reaction space in a vacuum vessel capable of being evacuated to a vacuum, through a shower head and a film is formed through a chemical reaction taking place on a substrate heated by a substrate-supporting stage, wherein the reaction space is constructed by the substrate-supporting stage, the shower head and a movable deposition-inhibitory plate, wherein the substrate-supporting stage and the movable deposition-inhibitory plate are arranged to form, between them, a concentric gap or interstice serving as a gas-exhaust path through which an inert gas can flow from an upper portion of the gas-exhaust path along the movable deposition-inhibitory plate, wherein a single annular inert gas injection port is provided between the shower head and the deposition-inhibitory plate on an upstream side of the gas-exhaust path so that the inert gas can flow into the gas-exhaust path and down the inner wall of the deposition-inhibitory plate, wherein a stage cover is arranged on an outer peripheral side wall of the substrate-supporting stage, wherein an external space is formed between and bounded by an outer surface of the deposition-inhibitory plate and an inner surface of the vacuum vessel for receiving the inert gas before the inert gas enters the reaction space through the injection port, wherein a lower space is formed on a secondary side of the gas-exhaust path, the lower space being constructed by the substrate-supporting stage, and the movable deposition-inhibitory plate, and wherein an evacuation system is arranged at the bottom of the lower space.