Patent ID: 8835872
Filing Date: 2014-09-16
Classification: H01J,H01L

Abstract:
1. A sample stage device including a table for mounting a sample, a plurality of drive mechanisms provided so as to correspond to respective axial directions of a two-dimensional plane in which the table is moved, and a measuring mechanism for measuring a position of the table in each of the axial directions in real time, the sample stage device being configured to cause an action part of each of the drive mechanisms, which engages with the table with a gap in-between, to advance/retreat along the relevant axial direction to move the table in the relevant axial direction, the sample stage device comprising: logical pattern generator which, in moving the table, breaks up, in accordance with a pre-defined control parameter, an interval over which the table moves from the movement start position to a destination position in each of the axial directions, and generates a position command value per predetermined period in each of the axial directions; speed command value generator which generates, per predetermined period and based on a deviation between a position command value of the period and a measured position of the period as measured by the measuring mechanism, a speed command value for driving each of the drive mechanisms during the period; and drive mechanism driver which supplies to each of the drive mechanisms a drive signal that causes each of the action parts to advance/retreat in the corresponding axial direction at the generated speed command value.