Patent ID: 11919124
Assignee: EBARA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G  H | IPC B

Claim 18:
19. A polishing apparatus, comprising:
at least one polishing unit including a polishing table for supporting a polishing pad, and a polishing head for pressing a substrate against the polishing pad; and
a pad-temperature regulating apparatus for reaching a temperature of a surface of the polishing pad to a predetermined target temperature and then maintaining the temperature of the surface of the polishing pad at the target temperature,
wherein the pad-temperature regulating apparatus includes:
a pad contact member which can be placed into contact with the surface of the polishing pad, and has a heating flow passage and a cooling flow passage formed therein;
a liquid supply system which includes a heating-liquid supply pipe coupled to the heating flow passage, a cooling-liquid supply pipe coupled to the cooling flow passage, a first flow control valve attached to the heating-liquid supply pipe, and a second flow control valve attached to the cooling-liquid supply pipe, and supplies a heating liquid having a regulated temperature and a cooling liquid having a regulated temperature, into the pad contact member;
a pad-temperature measuring device for measuring the temperature of the surface of the polishing pad; and
a controller for performing a PID control of manipulated variables of the first flow control valve and the second flow control valve based on a difference between a measured value of the pad-temperature measuring device and the predetermined target temperature,

wherein the controller includes:
a memory in which a learned model constructed by machine learning to maintain a temperature behavior curve, which is created based on measured values of the pad-temperature measuring device and measurement time points thereof, and which represents a temporal change in the temperature of the surface of the polishing pad from a time point when the pad contact member starts regulating of the temperature of the surface of the polishing pad to a time point when the target temperature is reached, within a predetermined allowable range, is stored; and
a processing device which inputs at least one temperature behavior parameter to the learned model, and performs a calculation to output a change value of PID parameter for the PID control.