Wafer Cassette Support Arms for Mixed-Size Overhead Transport
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Solution Overview
Problem
Semiconductor fabrication processes face challenges in safely transporting wafer cassettes of varying types and dimensions, as existing overhead transport systems are not designed to handle all sizes, leading to potential damage or accidental drops during transport.
Innovation Solution
An integrated wafer cassette stocker system with a support member system that can be associated with overhead transport vehicles, featuring adjustable components and safety mechanisms to prevent accidental drops and support cassettes of different sizes, including a multi-cassette rack and sorter for efficient storage and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overhead transport systems are designed to handle only one specific type of wafer cassette, then the transport system can be optimized for that specific cassette type, but the system cannot accommodate cassettes of different sizes and types, leading to potential damage when other cassette types are inadvertently transported
Solution Approach 1:
The support member system includes movable arms that can dynamically adjust their position and configuration based on the size and type of wafer cassette being transported. The arms transition between extended and retracted positions, and between different support configurations, allowing the system to adapt to various cassette dimensions while maintaining secure support and preventing damage
Solution Approach 2:
The overhead transport system is equipped with a universal support member system that can handle multiple types of wafer cassettes (FOUPs, tray cassettes, magazine cassettes) with a single mechanism. The support arms and positioning mechanisms are designed to accommodate different cassette sizes and configurations, eliminating the need for separate transport systems for each cassette type
2Reliability
If separate transport systems are implemented for different wafer cassette types, then each system can be optimized for its specific cassette type, but the device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple specialized transport functions into a single overhead transport system. By integrating the support member system with adjustable arms, positioning mechanisms, and detection sensors, the system merges the capabilities of what would otherwise require separate transport systems for FOUPs, tray cassettes, and magazine cassettes into one unified mechanism
Solution Approach 2:
A single overhead transport vehicle is designed with universal support capabilities to handle different cassette types. The support arms, positioning mechanisms, and control systems are configured to provide appropriate support for various cassette dimensions and configurations, reducing the total number of transport systems needed in the fabrication facility
3Ease of manufacture
If the overhead transport system uses fixed support structures, then the system is simpler to design and manufacture, but it cannot accommodate cassettes of varying dimensions and may cause damage to improperly sized cassettes
Solution Approach 1:
The support member system replaces fixed structures with dynamic, movable components. The support arms can extend and retract, position themselves at different locations, and adjust their configuration based on the cassette being transported. This dynamic capability allows the system to accommodate various cassette sizes while maintaining relatively simple mechanical designs
Data Source
AI summary
A support member system is described for association with an overhead transport system. The support member system provides a safety feature to the overhead transport system by which the overhead transport system is able to avoid damage to wafers that are contained within a wafer cassette that is unintentionally released by the overhead transport system. The support member system is able to prevent such released cassettes from impacting the ground or tools located under the overhead transport system. The support member system targets wafer cassettes that have dimensions which are different than the dimensions of wafer cassettes for which the overhead transport system was originally designed to transport. Stocker systems for receiving, storing and delivering different types of wafer cassettes are also described.