Mirror-Image Clearance Detection for Substrate Transfer
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Solution Overview
Problem
Existing substrate transfer systems face challenges in preventing the mirror-like main surface of substrates from scratching against system components during transfer due to unstable monitoring of clearance caused by thin substrates and reflected light effects.
Innovation Solution
A substrate transfer system that includes an imaging section capturing both a mirror image and a real image of system components relative to the substrate, allowing stable monitoring of clearance through apparent image differences, with a judgment section determining abnormality based on these images and a notification system for alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an imaging section is installed to capture the substrate and system component from directly beside the substrate, then the clearance can be monitored, but the monitoring becomes unstable due to thin substrate and reflected light effects
Solution Approach 1:
Instead of capturing the substrate and system component directly from the side (conventional approach), the patent captures the mirror image of the system component reflected on the substrate's surface. This inversion approach transforms the measurement problem into a solvable one by using the reflected light path to determine clearance, thereby eliminating the instability caused by direct observation of thin substrates.
Solution Approach 2:
The patent creates a mirror image copy of the system component on the substrate's surface. This copy serves as a stable reference for measurement, allowing the imaging section to monitor clearance through the reflected image rather than directly observing the actual component, thus avoiding the harmful effects of direct observation on thin substrates.
2Productivity
If the substrate is moved close to the system component, then transfer efficiency is improved, but the risk of contact and scratches increases
Solution Approach 1:
The patent implements a feedback mechanism where the imaging section continuously captures the mirror image of the system component, and the judgment section analyzes the image to determine clearance. This real-time feedback allows the system to adjust the substrate's position dynamically, enabling close approach for high transfer efficiency while preventing contact that would cause scratches.
Solution Approach 2:
The patent performs preliminary monitoring of the clearance between the substrate and system component using the mirror image capture before actual contact occurs. The judgment section evaluates the captured images in advance to predict potential contact, allowing preventive measures to be taken before scratches can occur, thus maintaining both efficiency and reliability.
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
Prevents substrate scratches by ensuring stable clearance monitoring and timely alerts, thereby maintaining substrate integrity during transfer.
Implementation Method 1
an imaging section that captures a mirror image of the system component reflected on a mirror-like main surface of the substrate
Data Source
AI summary
The provided is a substrate transfer system that can prevent the mirror-like main surface of the substrate from coming into contact with the system components during transfer and causing scratches on the main surface. The substrate transfer system has a system component; a transfer section that moves a substrate relative to the system component; an imaging section that captures a mirror image of the system component reflected on a mirror-like main surface of the substrate and a real image of the system component, when the substrate is moved by the transfer section; and a judgment section that performs an abnormality judgment to determine whether any abnormality exists in clearance between the main surface of the substrate and the system component, based on the mirror image and the real image captured by the imaging section.