Substrate Rotator Edge Metrology for Defect Detection
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Solution Overview
Problem
Conventional substrate test systems face inefficiencies due to the inability to detect damaged substrates, leading to wasted time and energy, as well as potential system jams, which increase the cost of ownership.
Innovation Solution
A substrate rotator and edge metrology system that rotates substrates to analyze all four sides for defects, allowing for easier recognition and removal of undesired substrates without disrupting conveyor movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comprehensive inspection processes are implemented to detect damaged substrates, then measurement precision and reliability improve, but inspection time increases and productivity decreases
Solution Approach 1:
The inspection system transitions from examining only the top surface of substrates to inspecting multiple surfaces including sides and bottom by rotating substrates through different orientations. This dimensional approach enables comprehensive defect detection without requiring multiple separate inspection stations, thereby maintaining productivity while improving measurement precision.
Solution Approach 2:
The substrate handling system incorporates dynamic rotation mechanisms that continuously change substrate orientation during conveyance. This allows a single inspection station to examine all surfaces of substrates over time, eliminating the need for multiple static inspection stations and maintaining high throughput while achieving comprehensive inspection.
2Measurement precision
If multiple inspection stations are added to achieve comprehensive inspection, then measurement precision improves, but device complexity and loss of time increase
Solution Approach 1:
Multiple inspection functions that would traditionally require separate inspection stations are merged into a single integrated system. By combining rotation mechanisms with inspection equipment, the system achieves comprehensive multi-surface inspection capability at one location, reducing device complexity and substrate transfer time while maintaining measurement precision.
Solution Approach 2:
The single inspection station is designed with universal capability to inspect all surfaces of substrates through dynamic rotation. This multi-functional approach replaces multiple specialized inspection stations, simplifying the overall system architecture while maintaining comprehensive inspection capability.
3Productivity
If damaged substrates are not detected, then productivity is maintained by avoiding inspection delays, but harmful factors increase due to system jams and manual intervention
Solution Approach 1:
The inspection system performs preliminary detection of damaged substrates before they can cause harm to downstream equipment. By identifying defective substrates early in the process, the system prevents damaged items from proceeding to processing stations where they could cause jams, equipment damage, or safety issues, thereby protecting continuous operation without sacrificing productivity.
Data Source
AI summary
A substrate rotator configured to rotate one or more substrates includes a body, a body actuator coupled to the body and configured to rotate the body, and a first and second gripper coupled to the body. A substrate edge metrology system that measures side chips or other defects on all sides of the substrate is also described. The metrology system includes two metrology stations and the substrate rotator. Methods for measuring side chips or other defects on a substrate are also provided. The method includes performing metrology on a first set of sides of the first substrate, rotating the first substrate by a first angle, and performing metrology on the second set of sides of the first substrate.