Load Port Image Verification for Cable-Free Material Handling
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Solution Overview
Problem
The existing automatic handling systems in semiconductor factories face issues with spatial interference and high costs due to the extensive use of E84 sensors and their cables, which are necessary for safe material transportation but prone to interference and high installation costs.
Innovation Solution
An automatic handling system that uses image capturing devices to verify the status of load ports through visual signals, reducing the need for physical E84 sensors by confirming load and unload requests and detecting foreign objects, thereby minimizing cable interference and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If E84 sensors and cables are installed on the OHT track to enable interlocking communication for safe material transportation, then safety during material handling is improved, but spatial interference increases and installation cost rises
Solution Approach 1:
The patent replaces the mechanical E84 sensor and cable system with a wireless communication system. The OHT controller and production machine controller communicate interlocking signals wirelessly, eliminating the need for physical cables running along the OHT track. This substitution maintains safety functionality while removing the spatial interference problem caused by numerous cables
Solution Approach 2:
The patent introduces wireless communication as an intermediary medium to transfer interlocking signals between the OHT and production machines. Instead of direct physical connections via cables, wireless signals act as intermediaries to convey safety information, achieving the same safety objective without the harmful spatial interference of cable routing
2Reliability
If E84 sensors are installed on every pick-and-place port to ensure safe operation, then safety interlocking is improved, but installation cost increases
Solution Approach 1:
The patent makes the wireless communication system universal, allowing a single communication infrastructure to serve all pick-and-place ports across multiple production machines. Instead of installing separate E84 sensor systems at each port, the wireless system provides safety interlocking functionality universally, reducing the total number of components and installation costs while maintaining safety standards
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 enhances the accuracy of material handling operations by verifying load/unload conditions and identifying foreign objects without physical contact, reducing spatial interference and costs associated with E84 sensors.
Implementation Method 1
controlling an image capturing device of the handling device to capture an image of the load port
Data Source
AI summary
The present disclosure provides a method of operating an automatic handling system. The method includes: controlling a handling device to move forward to a load port of a production equipment; receiving a signal of a load request by a receiver of the handling device; controlling an image capturing device of the handling device to capture an image of the load port; determining whether the receiver receives the signal of the load request; and determining whether there is any abnormal condition in the load port.