Wafer Carrier Optical Inspection for Defect Screening
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Solution Overview
Problem
There is no existing tool for inspecting wafer carriers to detect quality defects or catastrophic failures, which can impact the quality of wafers held inside the carrier.
Innovation Solution
An apparatus and method for automatically inspecting wafer carriers using a 6-axis robot, cameras, and a load/unload mechanism, which captures images of the wafer carrier and processes them using an automated optical inspection (AOI) algorithm to detect defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wafer carriers are used repeatedly for transporting wafers, then productivity is improved through efficient wafer transport, but reliability deteriorates due to quality defects and catastrophic failures in the carriers
Solution Approach 1:
The system performs preliminary inspection of wafer carriers before they are used to transport wafers. The inspection apparatus detects defects such as broken tenons, worn mini-contacts, and latch key groove defects before the carrier enters service, preventing defective carriers from compromising wafer quality. This advance detection resolves the contradiction by ensuring carrier reliability is verified before each transport cycle while maintaining productivity through automated inspection.
2Reliability
If manual inspection of wafer carriers is performed, then reliability can be maintained through defect detection, but productivity decreases due to time-consuming inspection processes
Solution Approach 1:
The system replaces manual mechanical inspection with an automated optical inspection apparatus. Cameras capture images of the wafer carrier, and image processing algorithms automatically detect defects such as broken tenons, worn mini-contacts, and filter defects. This substitution maintains high reliability through accurate defect detection while dramatically improving productivity by eliminating time-consuming manual inspection processes.
3Reliability
If comprehensive inspection of wafer carriers is performed to detect all defects, then reliability is improved through thorough defect detection, but device complexity increases due to multiple inspection components
Solution Approach 1:
The inspection apparatus is designed as a multi-functional integrated system that can detect multiple types of defects using a unified platform. The same camera and image processing system that detects broken tenons can also identify worn mini-contacts, latch key groove defects, and filter issues. This universal approach improves reliability through comprehensive defect detection while avoiding the complexity of multiple separate inspection devices.
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 solution enables timely detection of wafer carrier defects, improving semiconductor production yield by reducing the use of defective carriers and allowing for prompt repairs, thereby maintaining the quality of wafers.
Implementation Method 1
capturing images of the wafer carrier
Data Source
AI summary
An apparatus for inspecting wafer carriers is disclosed. In one example, the apparatus includes: a housing; a load port; a robot arm inside the housing; and a processor. The load port is configured to load a wafer carrier into the housing. The robot arm is configured to move a first camera connected to the robot arm. The first camera is configured to capture a plurality of images of the wafer carrier. The processor is configured to process the plurality of images to inspect the wafer carrier.