Torque-Limited Substrate Transfer Unit for Collision Detection
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Solution Overview
Problem
Conventional substrate processing apparatuses cannot immediately detect collisions during substrate conveyance, leading to potential damage due to a single, fixed torque limit value that is set to prevent damage but is too high for non-interference areas and too low for interference areas.
Innovation Solution
Implementing a transfer machine with individually set torque limit values for non-interference and interference areas, allowing the operation controller to monitor and compare detected torque values, and urgently stopping the transfer machine if an abnormal torque is detected in the interference area to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fixed torque limit value is set to prevent damage in non-interference areas, then the torque limit value can be set to a maximum torque value or larger, but collision detection in interference areas is delayed and damage may occur
Solution Approach 1:
The conveyance path is divided into two distinct areas: non-interference area (acceleration and deceleration zones) and interference area (constant velocity zone). Different torque limit values are assigned to each area, allowing optimized collision detection and damage prevention strategies for each segment of the conveyance operation.
Solution Approach 2:
Different torque limit values are applied to different spatial zones along the conveyance path. The interference area uses a lower torque limit value (first torque limit value) for sensitive collision detection, while the non-interference area uses a higher torque limit value (second torque limit value) to accommodate maximum torque during acceleration and deceleration.
2Productivity
If the torque limit value is set to a maximum torque value to accommodate non-interference area operations, then the conveyance mechanism can operate without restriction, but collision detection sensitivity in interference area is reduced
Solution Approach 1:
The torque limit value is made dynamic rather than fixed, changing based on the conveyance phase. The operation controller dynamically selects between the first torque limit value (for interference area) and the second torque limit value (for non-interference area) based on the current operational context, enabling both sensitive collision detection and full operational capability.
Solution Approach 2:
The operation controller pre-establishes different torque limit values for different operational areas before conveyance begins. This preliminary configuration allows the system to immediately apply the appropriate torque limit based on the conveyance phase, ensuring both collision detection sensitivity and operational productivity from the start of each conveyance cycle.
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 solution enables immediate detection and prevention of collisions, thereby protecting the substrate and substrate holder from damage during conveyance by differentiating torque limits for non-interference and interference areas, ensuring safe operation and minimizing downtime.
Implementation Method 1
an operation controller configured to monitor whether a torque value detected from the drive member is kept within a torque limit value by comparing the torque value with the torque limit value of the transfer machine
Data Source
AI summary
A transfer machine that charges a substrate contained in a substrate container to a substrate holder; a drive member that operates the transfer machine; and an operation controller that monitors whether a torque value detected from the drive member is kept within a torque limit value of the transfer machine by comparing the torque value with the torque limit value which is set individually for each of an interference area and a non-interference area excluding the interference area relative to conveyance operation in which the transfer machine is moved toward at least one of the substrate container and the substrate holder. The torque limit value in the non-interference area is set larger than the torque limit value in the interference area where a part of the transfer machine interferes with at least one of the substrate container and the substrate holder.