光刻投影物鏡動鏡柔順定位機構模型修正及分析
[Abstract]:Lithography projector lens is the core component of lithography machine. In order to ensure the demanding wavefront aberration requirement of projected light, the projection objective lens has adjustable moving lens in order to adjust its position and attitude, so as to eliminate the wave aberration caused by machining and adjusting errors. So as to ensure the transfer accuracy of the exposure pattern. Flexible positioning mechanism is a multi-degree-of-freedom micro-positioning mechanism based on flexure hinge elastic deformation and piezoelectric drive technology. It is the main part of the adjusting mechanism of lithography mirror. Due to the low stiffness of flexure hinges in compliant positioning mechanism and the severe response to environmental vibration, it is necessary to master the dynamic characteristics of the structure in order to ensure the stable dynamic imaging quality of the objective lens. Therefore, the following four aspects of analysis and research are carried out in this paper: (1) the working principle and structural characteristics of compliant positioning mechanism are analyzed, and the finite element simulation modeling and modal test are carried out, and the modeling errors are compared and analyzed. Based on the harmonic response analysis method, the modified objective function is determined, the variables and constraints are modified, the error of the modified model is less than 5%, and the accuracy of the analysis is met. (2) according to the stiffness and damping theory of fixed joint surface, the stiffness of bolt connection surface of compliant positioning mechanism is derived. The convergence solution is obtained by parameter correction as the initial value. The convergence solution changes within 10% of the theoretical solution, which shows that the stiffness theory is correct and the modified method is effective. (3) according to the modified model, the driving force-displacement relationship of compliant positioning mechanism is analyzed, and the workspace range of the mechanism is determined. The analysis shows that the effective stroke of the mechanism in X, Y and Z directions meets the design requirements. (4) the random vibration analysis and mirror aberration analysis of the modified model of compliant positioning mechanism are carried out. The results show that the modified model can accurately reflect the response of the mechanism to environmental vibration and the degree of influence on the aberration of lens, and the results show that the modified model can accurately reflect the response of the mechanism to environmental vibration and the degree of influence on lens aberration. It can provide important basis for structural optimization design, lens deformation analysis, vibration compensation and control.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TH74;TH112
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