Patent ID: 8876453

Claim:
A substrate processing apparatus comprising: a boat accommodating a substrate; a process pipe configured to accommodate the boat; a cover disposed below the boat and configured to open and close a furnace port disposed at a lower end of the process pipe; an elevation mechanism configured to move the cover upward and downward; a motor configured to drive the elevation mechanism; a sealing member configured to seal a space between the cover and a lower end surface of the process pipe; and a controller configured to: control a speed of the motor and limit a torque of the motor to be lower than a predetermined upper limit of the torque until the cover reaches a predetermined position when the sealing member is separated from a surface of the cover or the lower end surface of the process pipe such that the substrate is maintained at a rest position in the boat during a recovery from a deformation of the cover occurring when the sealing member is separated from the surface of the cover or the lower end surface of the process pipe; monitor a current position of the cover; and control a rotation of the motor based on a difference between the current position of the cover and a target position of the cover after the cover reaches the predetermined position.