Substrate Transfer Rail Sensing for Wheel Diameter and Sag
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Solution Overview
Problem
Existing substrate transfer systems in clean rooms face challenges in accurately measuring the diameter of traveling wheels and sagging height of rails during substrate transfer, which can affect the precision and efficiency of substrate handling.
Innovation Solution
A substrate transfer device equipped with a traveling unit, rail unit, and sensor unit, where sensors measure the diameter of traveling wheels and sagging height of rails in real-time while the unit is in motion, using laser sensors to ensure accurate alignment and measurement without stopping the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substrate transfer operations are performed continuously without stopping, then productivity is improved, but measurement precision of traveling wheel diameter and rail sagging deteriorates
Solution Approach 1:
The patent replaces mechanical measurement systems with optical sensors (laser sensors) that can measure traveling wheel diameter and rail sagging non-contactingly. This allows continuous measurement during substrate transfer operations without requiring the system to stop, thereby maintaining both high productivity and measurement precision simultaneously.
Solution Approach 2:
The patent introduces sensor units as intermediary devices that detect the positions of traveling wheels and rail protrusions. These sensors act as mediators between the moving components and the control system, enabling real-time measurement of dimensional parameters without interfering with the continuous substrate transfer process.
2Measurement precision
If multiple sensors are installed at different positions to measure traveling wheel diameter and rail sagging, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions into integrated sensor units that can simultaneously detect both traveling wheel positions and rail protrusion positions. By merging the measurement functions and using a coordinated sensor arrangement, the system achieves comprehensive measurement capability while minimizing the number of separate sensor components required.
Solution Approach 2:
The sensor units are designed with multi-functionality, capable of detecting various parameters including traveling wheel diameter, rail sagging, and relative positions. This universal sensing capability allows a single sensor unit to perform multiple measurement tasks, reducing overall device complexity while maintaining high measurement precision.
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
Enables precise and continuous measurement of traveling wheel diameters and rail sagging, enhancing the accuracy and efficiency of substrate transfer operations in clean room environments.
Implementation Method 1
measuring, by using a first sensor, a diameter of the traveling wheel at a time when the traveling wheel travels on the rail
Implementation Method 2
measuring, by using a second sensor, a descending height of the rail protrusion at the time when traveling wheel travels on the rail
Data Source
AI summary
A substrate transfer device includes: a traveling unit including a traveling wheel that travels on a rail to transfer a substrate in a first direction; a rail unit including the rail and a rail protrusion protruding from the rail in a second direction different from the first direction; and a sensor unit including a first sensor and a second sensor, wherein the first sensor senses the traveling unit, and the second sensor senses the rail protrusion, wherein the first and second sensors are placed at the same position as each other along the rail on a basis of the first direction.