Transfer Arm Velocity Synchronization for Wafer Handling
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Solution Overview
Problem
The existing substrate-processing apparatuses face challenges in efficiently loading and unloading substrates due to differences in velocity profiles of transfer arms, leading to asynchronous arrival at target points, which complicates simultaneous processing and increases transfer time.
Innovation Solution
The apparatus includes a control unit that adjusts the movement velocities of transfer arms to ensure simultaneous arrival at target points by calculating and resetting velocities based on expected arrival times, allowing for synchronized horizontal movement of multiple arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple transfer arms are driven independently with separate horizontal driving shafts, then each arm can operate autonomously, but the arms arrive at target points at different times due to assembling tolerance, reducing transfer efficiency
Solution Approach 1:
The patent combines multiple independent transfer arms into a single integrated transfer robot structure, where arms share common driving mechanisms and control systems. This merging allows synchronized movement and simultaneous arrival at target points, resolving the timing discrepancy caused by independent operation while maintaining operational flexibility.
Solution Approach 2:
The patent implements dynamic velocity adjustment for each transfer arm based on real-time position feedback and predicted arrival times. The control unit dynamically modifies movement profiles to ensure all arms arrive at their respective target points simultaneously, transforming the static independent operation into a dynamically coordinated system.
2Productivity
If transfer arms move at maximum velocity to reduce transfer time, then productivity increases, but precision in simultaneous arrival at target points decreases due to tolerance accumulation
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor the position and velocity of each transfer arm. The control unit uses this feedback information to calculate predicted arrival times and adjust velocities dynamically, ensuring simultaneous arrival even when operating at high speeds. This closed-loop control maintains synchronization accuracy while maximizing transfer speed.
Solution Approach 2:
The patent changes the velocity parameters of individual transfer arms dynamically during operation. Instead of maintaining constant maximum velocity, the system adjusts speed profiles based on real-time conditions and predicted timing, allowing high-speed operation while maintaining precise synchronization through parameter optimization.
Data Source
AI summary
Provided is a substrate-processing apparatus including a storage member, a transfer member, and a control unit. The transfer member includes a plurality of transfer arms that load or pick up a substrate to or from the storage member. The control unit controls velocity of the transfer arms such that the simultaneously driven transfer arms simultaneously arrive at target points. Accordingly, the transfer member loads or takes out a plurality of wafers at once to or from the storage member, so that the substrate-processing apparatus reduces transfer time and improves productivity.