Patent ID: 7601933

Claim:
A heat processing device that bakes a substrate having a resist coating film containing a volatile substance, the device comprising: a hot plate that heats the substrate; a hot plate temperature control unit that controls a temperature of the hot plate; control means for controlling the hot plate temperature control unit; a box member having wall surfaces that defines a heat space around the hot plate and defines a fluid space above the heat space, the heat space and the fluid space being communicated to each other and the wall surface that defines the heat space having no opening; air current producing means including an air supply port and a suction port opened in the wall surfaces that define the fluid space, that supplies a gas from the air supply port to the fluid space and exhausts the supplied gas from the fluid space via the suction port by suction, to create a current of air flowing in a substantially horizontal direction in the fluid space; a filter provided in the box member to partition the heat space and the fluid space from each other, that traps the volatile substance; and means for detecting a temperature of the filter, wherein the control means adjusts the distance between the filter and the substrate with reference to the detected temperature of the filter or a change in temperature of the filter.