Patent ID: 6235121
Filing Date: 2001-05-22
Classification: C23C,H01L

Abstract:
A vertical thermal treatment apparatus comprising a vertical reaction vessel, a lid member for closing a bottom portion of said reaction vessel, a rotational shaft penetrating in a vertical direction upwards from below through said lid member and into said reaction vessel, a turntable provided on said rotational shaft within said reaction vessel and supporting a support member for a substrate to be processed, and a rotational drive mechanism for driving said rotational shaft in rotation to rotate said support member for a substrate to be processed, said thermal treatment apparatus further comprising:a substantially cylindrical fixing member fixed to said lid member and having a shaft hole through which said rotational shaft passes;a bottomed cylindrical outer shell member having a side wall portion surrounding said fixing member, with a space opened up between the side wall portion and the fixing member, and a bottom portion fixed hermetically to an outer peripheral surface of said rotational shaft below a lower end of said fixing member, for enabling communication between a gap between said shaft hole and said rotational shaft and a space on an outer side of said fixing member;a shaft bearing provided between said fixing member and said side wall portion, at an upper position within said opened-up space between said side wall portion and said fixing member; anda seal portion provided between said fixing member and said side wall portion to form a seal between an outer wall surface of said fixing member and an inner wall surface of said side wall portion, at a lower position in said opened-up space between said side wall portion and said fixing member.