Patent ID: 11869813
Assignee: CANON KABUSHIKI KAISHA
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 6:
7. The method of claim 6, further comprising estimating the calibrated spring forces, prior to performing planarization by:
moving a planarization head including the superstrate chuck to a first position above where the stack is to be located when planarization is being performed;
gathering positions and information of applied control forces of the planarization head after the planarization head settling down to the first position;
moving the planarization head to a second position below where the stack will be located when planarization is being performed;
gathering positions and applied forces information of the planarization head after the planarization head settling down to the second position; and
calibrating the spring force based on the position and applied forces information gathered from upward and downward movements of the planarization head.