Dual-Blade End Effector for Contamination-Free Substrate Transfer
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Solution Overview
Problem
Conventional substrate transfer robots suffer from reduced throughput due to contamination of blades during the transfer of semiconductor substrates, leading to increased transfer time as contaminated and cleaned substrates are handled by the same blades, causing recontamination and efficiency losses.
Innovation Solution
An end effector with a wrist plate and dual blades, where one blade supports a contaminated substrate and the other a cleaned substrate, utilizing an elevating unit to switch positions and prevent contamination, allowing for simultaneous handling of multiple substrates and improving transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same blade transfers both contaminated and cleaned substrates, then the device complexity is reduced, but the productivity deteriorates due to recontamination and increased transfer time
Solution Approach 1:
The single blade is segmented into two separate blades: a first blade for transferring contaminated substrates and a second blade for transferring cleaned substrates. This segmentation prevents cross-contamination and allows parallel processing, thereby improving productivity without significantly increasing overall device complexity
Solution Approach 2:
The blade assembly is designed with multi-functionality, where the wrist plate can selectively position either the first blade or the second blade for substrate transfer. This universal design allows the same mechanical structure to handle different substrate types (contaminated or cleaned) based on process requirements
2Productivity
If separate blades are used for contaminated and cleaned substrates, then the productivity is improved by preventing recontamination, but the device complexity increases
Solution Approach 1:
The first blade and second blade are merged into a single integrated blade assembly mounted on the wrist plate. This combining approach allows both blades to share the same mounting structure and control mechanism, reducing the increase in device complexity while maintaining the productivity benefits of having separate contamination zones
Solution Approach 2:
The blade assembly incorporates dynamic positioning capability through the wrist plate, which can rotate to bring either the first blade or second blade into the transfer position. This dynamic configuration allows the system to adapt to different process requirements without requiring separate fixed installations for each blade type
Data Source
AI summary
In a substrate transfer robot, an end effector includes a wrist plate, a first blade movably connected to the wrist plate in a vertical direction to support a first substrate, and a second blade connected to the wrist plate to support a second substrate, wherein the second blade is adjacent to the first blade. An elevating unit moves the first blade upward to allow the first blade to support the first substrate and moves the first blade downward to allow the second blade to support the second substrate.