Substrate Transfer Arm Contact Detection for Holder Misalignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing substrate transfer systems lack effective methods for detecting abnormalities in transfer devices, which can lead to reduced throughput and increased maintenance needs due to potential misalignment or improper installation of substrate holders.
Innovation Solution
An abnormality detection method utilizing a substrate holder with a suction mechanism and position detectors to monitor pressure changes and substrate positioning, allowing for real-time detection of abnormal states without external sensors, enabling timely maintenance and preventing unintended contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If substrate holder installation is performed manually without detection mechanisms, then device complexity is reduced, but manufacturing precision deteriorates due to potential misalignment
Solution Approach 1:
The substrate holder itself serves as the detection target, utilizing its own structural features (suction holes, bottom surface) to provide detection signals. The holder's position and installation state are detected through pressure changes in the suction passage, allowing the component to participate in its own verification without requiring separate detection devices.
Solution Approach 2:
The suction passage and pressure detector act as intermediaries between the substrate holder and the control system. Instead of directly measuring holder position, the system detects pressure changes in the suction passage that occur when the holder is properly installed, providing an indirect but reliable detection method.
2Reliability
If abnormality detection systems are added to transfer devices, then reliability is improved, but device complexity increases
Solution Approach 1:
The suction mechanism serves dual purposes: it provides the necessary vacuum function for substrate handling and simultaneously serves as a detection mechanism. The pressure detector monitors both the substrate suction status and the holder installation state, allowing one component to perform multiple functions.
Solution Approach 2:
The detection function is merged with the existing suction mechanism rather than being implemented as a separate system. The pressure detector integrates with the suction passage, and the same pressure sensing capability is used for both substrate detection and holder installation verification.
3Productivity
If real-time monitoring of substrate holder position is implemented, then productivity is maintained, but device complexity increases
Solution Approach 1:
The pressure detector provides continuous feedback on the substrate holder's installation state and position. When abnormality is detected through pressure changes, the system can immediately respond by stopping operations or alerting operators, preventing defects and maintaining efficient production flow.
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
This method effectively detects abnormal states in transfer devices, preventing decreased throughput and promoting maintenance, ensuring accurate substrate handling and transfer operations.
Implementation Method 1
a pressure detector configured to detect a pressure of a suction passage communicating with the suction hole
Data Source
AI summary
There is an abnormality detection method for a transfer device including an arm having a substrate holder to hold a substrate, an elevating mechanism to raise and lower the arm, a position detector to detect a position of the substrate holder, a suction hole formed at the substrate holder, and a pressure detector to detect a pressure of a suction passage communicating with the suction hole, the method comprising: controlling the arm to move the substrate holder to a position below the substrate; controlling the elevating mechanism to raise the arm and the substrate holder; detecting contact between the substrate and the substrate holder based on a pressure change detected by the pressure detector; detecting, by using the position detector, a position of the substrate holder at the time of detecting the contact; and detecting an abnormal state of the transfer device based on the detected position.