大行程納米級定位工作臺的結(jié)構(gòu)設(shè)計
[Abstract]:Considering that the performance of the scanning interference field exposure system using static three-step splicing exposure method is related to the positioning accuracy and stability of the worktable, a two-dimensional worktable with large stroke and high precision is designed to improve its positioning accuracy. The macro and micro feed mechanism is composed of friction drive and piezoelectric ceramic micro displacement mechanism. The closed gas hydrostatic guide rail drives the worktable to realize the grating indexing and scanning motion along the XY direction. The friction driving mechanism and the gas static guide rail structure are optimized and the natural frequency of the whole structure of the worktable is analyzed by finite element method. The alignment of the guide rail in the XY direction is measured by using the autocollimator. The results show that the yaw and pitch accuracy in both directions are within 鹵0.04 渭 m. The laser interferometer is used to detect the orientation accuracy and noise of the guide rail in X direction. The results show that the positioning accuracy of X direction is better than 鹵5 nm and the positioning stability is 鹵25 nm for the worktable with the X direction travel of 220 mm / Y and 300mm. The results obtained meet the requirements of nanometer level positioning accuracy of the scanning interferometric exposure system.
【作者單位】: 中國科學院長春光學精密機械與物理研究所;
【基金】:國家重大科學儀器設(shè)備開發(fā)專項資助項目(No.61227901)
【分類號】:TH122
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