Vacuum Chuck Edge Sealing for Warped Substrate Flattening
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Solution Overview
Problem
Conventional vacuum chucking mechanisms struggle to securely hold warped substrates due to the need for high air flow rates, which adversely affect stage precision and are not economically viable, and the edges of warped substrates are prone to lifting off, causing vacuum leaks.
Innovation Solution
A system employing sealing members, such as o-rings or clamps, to form a vacuum seal proximate to the substrate edges, combined with a substrate flattening unit to ensure the substrate is flattened and secured effectively on the vacuum chuck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high air flow rates are used to hold warped substrates, then substrate securing capability is improved, but stage precision deteriorates
Solution Approach 1:
The vacuum chuck surface is divided into multiple independently controllable vacuum zones. Each zone can be activated or deactivated based on substrate requirements, allowing localized vacuum application without requiring high overall air flow rates. This segmentation enables secure holding of warped substrates while maintaining stage precision by avoiding excessive vacuum pressure.
Solution Approach 2:
Different regions of the vacuum chuck provide different vacuum characteristics tailored to local substrate conditions. Warped areas receive targeted vacuum application while flat areas maintain standard holding, optimizing both substrate securing and stage precision without compromising either.
2Reliability
If conventional vacuum chucking is used on warped substrates, then substrate holding is attempted, but vacuum leaks occur due to edge lifting
Solution Approach 1:
A flattening unit is positioned above the substrate and activated before vacuum chucking begins. This preliminary flattening action presses the warped substrate into a flat configuration, ensuring that edges make proper contact with the vacuum chuck surface. Once flattened, the vacuum seal is established without edge lifting or leaks.
Solution Approach 2:
The flattening unit acts as an intermediary between the warped substrate and the vacuum chuck. It temporarily applies mechanical pressure to correct substrate warpage, enabling the vacuum chuck to then secure the flattened substrate without experiencing edge lifting or vacuum leaks.
3Productivity
If warped substrates are processed without flattening, then processing can proceed, but manufacturing precision deteriorates due to non-uniform substrate contact
Solution Approach 1:
The flattening unit is integrated into the processing workflow and activates automatically before each substrate is secured to the vacuum chuck. This preliminary flattening ensures uniform substrate contact with the chuck surface, maintaining manufacturing precision without significantly impacting processing throughput.
Solution Approach 2:
The mechanical flattening unit replaces complex mechanical adjustment systems that would otherwise be needed to accommodate warped substrates. By actively flattening the substrate beforehand, the system maintains precision without requiring intricate mechanical compensation mechanisms during processing.
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 system securely holds warped substrates by forming a vacuum seal at the edges, allowing for uniform processing and increased yield by preventing vacuum leaks and maintaining substrate flatness during operations.
Implementation Method 1
a vacuum seal is formed between the vacuum chuck and the substrate
Implementation Method 2
a substrate flattening unit configured to apply a downward force to a top surface of the substrate to flatten the substrate
Data Source
AI summary
A system is disclosed, including a vacuum a chuck configured to secure a substrate. The system further includes a substrate flattening unit configured to apply a downward force to a top surface of the substrate to flatten the substrate on the vacuum chuck. The system further includes one or more sealing members configured to form a vacuum seal between the vacuum chuck and the substrate proximate to one or more peripheral edges of the substrate when the substrate is flattened by the substrate flattening unit.