Invention Grant
- Patent Title: Frequency selective iterative learning control system and method for controlling errors in stage movement
- Patent Title (中): 频率选择性迭代学习控制系统和控制阶段运动误差的方法
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Application No.: US12323117Application Date: 2008-11-25
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Publication No.: US08649885B2Publication Date: 2014-02-11
- Inventor: Rene Sanchez
- Applicant: Rene Sanchez
- Applicant Address: JP Tokyo
- Assignee: Nikon Corporation
- Current Assignee: Nikon Corporation
- Current Assignee Address: JP Tokyo
- Agency: Roeder & Broder LLP
- Main IPC: G05B13/02
- IPC: G05B13/02 ; G05B19/18 ; G03B27/58 ; G03B27/32

Abstract:
Methods and control systems are provided for controlling stage position errors based, in some embodiments, on a selection of frequency components in a stage position error signal. An error frequency representation of a position error signal may be generated in the frequency domain and filtered by selecting one or more desired frequency components. The filtered error frequency representation can then be manipulated according to a control law and transformed back into the time domain to generate a current control signal. The current control signal can then be used to adjust the position of the stage to reduce positioning error.
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