Mirror Array Local Control for Oscillation Damping
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Solution Overview
Problem
Existing mirror systems for projection exposure apparatuses face challenges in efficiently damping oscillations and positioning mirror elements due to complex data flow and limited bandwidth, which affects the precision and stability of micro- or nanostructured component production.
Innovation Solution
Implementing a dual control system with local regulating devices integrated into the optical component or carrying structure for damping oscillations and a global control system for absolute positioning, allowing for separate signal paths and actuator activation, thereby reducing data flow and improving frequency range damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single global control system is used for positioning mirror elements, then the system structure is simple, but the damping of oscillations in specific frequency ranges is insufficient
Solution Approach 1:
The control system is divided into a global control system for absolute positioning and multiple local control systems for damping oscillations. Each local control system is integrated into individual mirror elements or their carriers, enabling independent oscillation damping while maintaining overall system simplicity through modular architecture.
Solution Approach 2:
Local control systems are implemented specifically at the mirror element level where oscillation damping is most critical. These local systems have bandwidths matched to the natural frequencies of individual mirror elements (at least 500 Hz, preferably 1 kHz or higher), providing targeted damping without requiring complex global control for each frequency range.
2Manufacturing precision
If complex data flow is used for positioning mirror elements, then positioning precision can be maintained, but the data processing load and system complexity increase
Solution Approach 1:
The data flow is segmented into two separate paths: a global control path for absolute positioning commands and local control paths for oscillation damping feedback. This segmentation reduces the data processing load on the global system while maintaining positioning precision through distributed local processing of vibration signals.
Solution Approach 2:
Local control systems act as intermediaries between the mirror elements and the global control system. They process oscillation data locally and only exchange necessary positioning commands with the global system, reducing overall data flow complexity while maintaining precision through localized feedback processing.
3Speed
If the bandwidth of the control system is limited, then the system response is fast, but the damping effectiveness in higher frequency ranges is reduced
Solution Approach 1:
The control bandwidth requirement is segmented across multiple independent local control systems. Each local system operates at high bandwidth (at least 500 Hz, preferably 1 kHz or higher) to dampen oscillations at the natural frequencies of individual mirror elements, while the global system maintains fast response for absolute positioning commands.
Solution Approach 2:
High bandwidth is implemented locally at each mirror element's control system rather than requiring the entire global system to operate at high bandwidth. This allows effective damping of high-frequency oscillations at the source while keeping the global positioning system responsive and efficient.
Data Source
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AI summary
An optical component (40) comprises a mirror array (22) having a multiplicity of mirror elements (23), which are each connected to at least one actuator (131) for displacement, a multiplicity of signal lines (47) for the signal-transmitting connection of the actuators (131) to an external, global control/regulating device (134) for predefining an absolute position of the individual mirror elements (23), and a multiplicity of local regulating devices (136) for regulating the positioning of the mirror elements (23), wherein the regulating devices (136) are in each case completely integrated into the component (40; 40a).