Buffer Station Emergency Access Port for Semiconductor Stockers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In semiconductor fabrication facilities, the storage and retrieval of workpieces and reticles are complicated due to cleanliness requirements, and failures in stocker systems can lead to isolation and shutdowns, as there is no reliable mechanism for emergency access or efficient workflow management during equipment failures.
Innovation Solution
The implementation of buffer stations that act as intermediate storage and retrieval points between storage chambers and IC stations, equipped with emergency access ports and algorithms for determining workpiece flow sequences, allowing for uninterrupted operation even during equipment failures by storing needed workpieces for a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the storage areas are sealed off with load-locks and inert gas flow to maintain cleanliness, then the cleanliness and protection of articles are improved, but the accessibility and ease of retrieval are worsened when equipment fails
Solution Approach 1:
An emergency access port is introduced as an intermediary component between the sealed storage area and the external environment. This port includes a port cover that can be opened to allow direct access to articles without compromising the sealed environment during normal operation. The port cover acts as a mediator that enables emergency retrieval while maintaining the cleanliness barrier during regular operations.
2Productivity
If the stocker system is designed with multiple components (transport mechanism, load lock, robotic mechanism) to automate workpiece handling, then the productivity and efficiency are improved, but the reliability and failure risk are worsened
Solution Approach 1:
The emergency access port is prepared in advance as a pre-configured backup pathway. The port cover is designed to be openable from the external side, and the port itself is positioned to provide direct access to the storage area. This preliminary preparation ensures that when equipment failures occur, there is an immediate alternative access route available without requiring complex repair or bypass procedures.
3Stability of the object's composition
If the storage environment is maintained with constant purging and inert gas flow to prevent chemical reactions, then the chemical stability of articles is improved, but the device complexity and cost are worsened
Solution Approach 1:
The gas flow system is segmented into distinct zones: a sealed storage area with constant purging and inert gas flow for chemical stability, and an emergency access port that can be temporarily opened when needed. The port cover creates a boundary that allows the complex gas flow system to be localized only where needed (in the sealed storage area) rather than throughout the entire system, reducing overall complexity while maintaining chemical stability where required.
Data Source
AI summary
A buffer station provides potential improvement for the operation of a facility. By storing to-be accessed workpieces in the buffer stations of an equipment, the operation of the facility is not interrupted when the equipment is down. The workpieces can be retrieved through emergency access port of the buffer station, thus ensure the continuous supply of workpieces for the workpiece flow of the facility. Algorithm for getting the needed workpieces to the buffer station is also provided through a controller or a computer mechanism. The buffer station can be incorporated in a stocker, such as wafer stocker or reticle stocker.