Movable Electrode Mechanism for Laser Discharge Gap Adjustment
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Solution Overview
Problem
In semiconductor exposure apparatuses, the widening gap between electrodes due to electrode abrasion during high-voltage discharges leads to unstable discharge states, reducing the ability to maintain desired pulse energy and resolution, with existing methods lacking a feasible and easy method to adjust this gap.
Innovation Solution
A laser apparatus with a mechanism for moving electrodes, where one electrode is supported by a connector to adjust the gap with the other electrode, maintaining electrical connection and allowing precise adjustment of the interelectrode gap to maintain stable discharge and pulse energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage discharges are performed continuously, then pulse energy is produced, but electrode abrasion occurs causing gap widening and discharge instability
Solution Approach 1:
The electrode is designed to be movable rather than fixed. The connector allows the electrode to adjust its position dynamically, compensating for abrasion-induced gap changes. This dynamic adjustment capability maintains stable discharge conditions over extended operational periods.
Solution Approach 2:
The system changes the physical parameter of electrode position to compensate for wear. By allowing the electrode to move and adjust its location, the interelectrode gap remains consistent despite material loss from continuous discharges, thereby maintaining discharge stability.
2Device complexity
If the gap between electrodes is not adjusted, then the structure is simple, but discharge state becomes unstable due to gap widening
Solution Approach 1:
A movable electrode structure with a connector is introduced, transforming the static electrode arrangement into a dynamic system. This allows the electrode to self-adjust or be adjusted to compensate for wear, maintaining stable discharge without requiring complex active control mechanisms.
3Duration of action of stationary object
If the electrode gap widens due to abrasion, then operational time is extended without adjustment, but pulse energy decreases
Solution Approach 1:
The movable electrode design enables the system to maintain optimal gap distance throughout extended operation. By adjusting the electrode position to compensate for wear, the system preserves pulse energy levels while significantly extending operational time before maintenance is required.
Solution Approach 2:
The electrode structure is designed to self-compensate for wear through its movable nature. The connector facilitates automatic or manual repositioning that maintains the optimal discharge gap, allowing the system to maintain performance without external intervention for extended periods.
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
The mechanism allows for the maintenance of a specific gap between electrodes, ensuring stable discharge and extended operational time of the laser apparatus, thereby maintaining desired pulse energy and resolution.
Implementation Method 1
a first electrode 11a to which a voltage is applied from a power source 13 and a second electrode 11b that is grounded, the first and second electrodes being disposed in a laser chamber 10
Data Source
AI summary
A laser apparatus according to embodiments may include a laser chamber including a laser gain medium; a power source; a first electrode to which a voltage is applied from the power source and a second electrode that is grounded, the first and second electrodes being disposed in the laser chamber; and a connector connected to the power source, and supporting the first electrode in a way that allows the first electrode to move toward a side where the second electrode is disposed.