Tunable Spacer for Lithography Alignment
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Solution Overview
Problem
Current lithography apparatus adjustment methods using spacers are complex, costly, and time-consuming due to the need for multiple spacers of different heights, which complicates handling and logistics, and requires high-precision production for accurate adjustments.
Innovation Solution
A tunable spacer system that allows stepless adjustment of height using a gear mechanism with inclined gliding surfaces, enabling precise alignment of optical elements within the lithography apparatus without the need for multiple spacers, reducing production costs and simplifying logistics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple spacers of different heights are used to achieve accurate adjustment, then manufacturing precision is improved, but device complexity and logistics complexity increase
Solution Approach 1:
The spacer is designed with a tunable height mechanism that allows dynamic adjustment of the spacer's length. This enables a single spacer to replace multiple fixed-height spacers, reducing device complexity while maintaining adjustment accuracy through continuous or stepped height variation.
Solution Approach 2:
The spacer's height parameter is made variable rather than fixed. By implementing a height adjustment mechanism (such as a screw thread, telescopic structure, or adjustable wedge), the spacer can achieve different lengths to accommodate various alignment requirements, eliminating the need for multiple spacers with different predetermined heights.
2Adaptability or versatility
If multiple spacers of different heights are used to cover a large adjustment range, then adaptability is improved, but ease of operation deteriorates due to complicated handling and logistics
Solution Approach 1:
The single adjustable spacer provides continuous or fine-stepped height variation, enabling a large adjustment range (e.g., up to 0.5 mm) with one component. This eliminates the need to handle, store, and select from multiple spacers, significantly improving ease of operation while maintaining full adaptability.
Solution Approach 2:
The adjustable spacer serves multiple functions that would otherwise require different spacers: it can provide various height increments (10 μm steps), cover a wide adjustment range (0.5 mm), and replace an entire set of modular spacers. This multi-functionality simplifies logistics and operation.
3Manufacturing precision
If high-precision spacers are produced to achieve desired process tolerances, then manufacturing precision is improved, but ease of manufacture deteriorates due to complex production and cleaning processes
Solution Approach 1:
Instead of manufacturing many different high-precision spacers with fixed heights, the invention uses a single spacer type with an integrated adjustment mechanism. This reduces the number of manufacturing variants, simplifies production processes, and reduces cleaning requirements, while still achieving the desired ±2 μm accuracy through the adjustment mechanism.
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 tunable spacer system enables precise and efficient adjustment of optical elements, achieving the same accuracy as traditional modular systems while reducing production costs and simplifying handling, thereby improving the overall efficiency and cost-effectiveness of the lithography process.
Implementation Method 1
a gear mechanism which is designed to convert a linear movement of the displacement element relative to the housing element in a first spatial direction into a linear movement of the housing element in a second spatial direction differing from the first spatial direction
Data Source
AI summary
A method adjusts a first element of a lithography apparatus toward a second element of the lithography apparatus via a tunable spacer which is arranged between the first element and the second element. The method includes: determining an actual location of the first element; determining a nominal location of the first element; unloading the tunable spacer; adjusting a height of the tunable spacer to bring the first element from the actual location to the nominal location; and loading the tunable spacer.