Patent ID: 8090245

Claim:
An apparatus for heat treating a substrate, said apparatus comprising: a substrate holder unit including a substrate stage on which a substrate is to be placed and which is made of one of a carbon and a carbon covered material, a heating unit which is provided above said substrate stage, includes a heat dissipation surface opposing said substrate stage, and heats the substrate placed on said substrate stage in noncontact therewith radiation heat from said heat dissipation surface, a chamber in which said substrate holder unit and said heating unit are arranged, and an elevating device which vertically moves at least one of said substrate holder unit and said heating unit in said chamber to bring said substrate stage and said heat dissipation surface of said heating unit close to each other or apart from each other, wherein said substrate holder unit further comprises a radiation plate which is arranged under said substrate stage at a gap therefrom, catches heat emitted from a lower surface of said substrate stage, and radiates the caught heat toward said substrate stage, and a reflection plate which is arranged under said radiation plate at a gap therefrom and reflects heat emitted from said radiation plate, and wherein when said substrate holder unit is moved by said elevating device, the gap between said radiation plate and said reflection plate is unchanged.