Multi-Mirror Array Passive Electrical Damping for Positioning Stability
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Solution Overview
Problem
Multi-mirror arrangements in projection exposure systems are sensitive to interfering excitations due to low damping coefficients, leading to instability in mirror element positioning.
Innovation Solution
Incorporation of passive electrical damping means, such as series resistors, anti-parallel connected diodes, switched-capacitor structures, and transistor circuits, arranged in series or parallel with actuator electrodes to dissipate energy and stabilize mirror element displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If passive electrical damping means are added to the multi-mirror arrangement, then the stability of mirror element positioning is significantly improved, but the device complexity increases due to additional electrical components
Solution Approach 1:
The damping means are integrated directly into the existing actuator electrode circuitry by connecting them in series or parallel with the actuator electrodes. This merging approach allows the damping function to be added without requiring separate independent damping systems, thereby improving stability while minimizing additional complexity.
Solution Approach 2:
The patent replaces potential mechanical damping structures with passive electrical damping means. Instead of using mechanical friction or contact-based damping mechanisms, the invention uses electrical components (resistors, diodes, capacitor-transistor circuits) to provide damping through electrical pathways, simplifying the overall mechanical structure while achieving the desired stabilization effect.
2Reliability
If passive electrical damping means are used instead of active damping systems, then the system becomes less susceptible to noise from signal lines and easier to integrate, but the energy dissipation requirements increase
Solution Approach 1:
The patent employs passive electrical components that dissipate energy through resistance rather than requiring active feedback control. These passive damping means (resistors, diodes, capacitor-transistor circuits) convert mechanical vibration energy into heat through electrical resistance, providing a simple and reliable damping mechanism that does not require continuous power supply or complex control electronics, thereby reducing noise susceptibility while managing energy dissipation through controlled resistive pathways.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly improves the stability of mirror element positioning by efficiently damping disturbances, reducing complexity and noise susceptibility compared to active damping systems, while allowing for adjustable resistance to match individual mirror frequencies.
Implementation Method 1
the damping means are each designed as an energy dissipation device. In particular, they are each designed as a resistance device
Implementation Method 2
The actuators for moving the mirror elements are, in particular, electrical actuators, in particular electrostatic actuators
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A multi-mirror array having adjustable mirror elements (19) comprises passive electrical damping means (39) for damping irregularities in the adjusted positions of the mirror elements (19).