Dual-End Effector Substrate Transfer Robot for High-Speed Stability
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Solution Overview
Problem
Conventional substrate transfer robots experience instability and increased maintenance needs when operating at higher speeds, leading to reduced throughput and shorter lifespan.
Innovation Solution
A vacuum processing apparatus with a substrate transfer robot featuring a dual-end effector system that can hold multiple substrates in opposing directions, allowing for efficient transfer and reduced operational frequency, thereby maintaining high throughput without increasing robot speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the robot operating speed is increased to improve substrate loading and unloading rates, then productivity is improved, but substrate holding becomes unstable and maintenance frequency increases
Solution Approach 1:
The end effector is divided into a first holding group with not less than two holding units and a second holding group with not less than two holding units. Each holding unit can hold at least two substrates, creating multiple independent holding points that distribute the load and improve stability at high speeds.
Solution Approach 2:
The first and second holding groups are combined in a single end effector structure, with the second holding group facing the substrate storage unit when the first holding group is opposed to the carrier. This allows simultaneous substrate pickup from the storage unit and placement onto the carrier, doubling the throughput without increasing robot speed.
2Productivity
If the robot operating speed is increased to improve throughput, then productivity is improved, but the robot requires more frequent maintenance
Solution Approach 1:
The dual holding group configuration enables continuous substrate transfer operations. While one holding group is transferring substrates to the carrier, the other holding group is positioned to pick up the next batch from the storage unit, creating a continuous cycle that improves throughput without requiring faster robot movement.
Solution Approach 2:
The end effector utilizes spatial arrangement by positioning the first and second holding groups in opposite orientations. This dimensional arrangement allows the robot to perform substrate pickup and placement operations in parallel, effectively doubling the transfer rate without increasing the robot's operating speed or reducing its operational life.
3Productivity
If multiple substrates are held in each holding unit to improve loading efficiency, then productivity is improved, but the complexity of the end effector structure increases
Solution Approach 1:
Each holding unit in the first and second holding groups is designed with the same multi-functional capability to hold at least two substrates. This standardized design allows the end effector to handle varying substrate loads while maintaining a relatively simple, repeatable structural pattern that reduces overall complexity.
Data Source
AI summary
A robot according to this invention includes a driving mechanism, a first arm rotatably connected to the driving mechanism, a second arm rotatably connected to the first arm, and an X-shaped end effector rotatably disposed at the distal end of the second arm. Of the four distal ends of the end effector, two distal ends include holding units which can hold substrates in one direction, and the remaining two distal ends include holding units which can hold substrates in the opposite direction.