Self-damping End Effector Vibration Control
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Solution Overview
Problem
End effectors used in substrate handling systems for semiconductor and solar cell fabrication experience significant vibration due to acceleration forces, leading to unintended substrate shifting and reduced throughput.
Innovation Solution
The implementation of self-damping end effectors with integrated dampers that match the natural frequency of the fingers, reducing vibration amplitudes and allowing for higher operational speeds without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acceleration of an end effector is reduced to mitigate vibration, then substrate shifting is reduced, but throughput decreases
Solution Approach 1:
The patent applies mechanical vibration principles by attaching dampers with natural frequencies matched to the finger's natural frequency. This creates controlled vibrational interaction that dissipates unwanted vibration energy, allowing the end effector to maintain higher acceleration while minimizing substrate shifting through resonant damping of the finger vibrations.
Solution Approach 2:
The patent changes the physical parameters of the finger structure by attaching dampers with specific mass and natural frequency characteristics. By carefully selecting the damper parameters (mass, stiffness, natural frequency) to match the finger's natural frequency, the system transforms the vibration problem into a controlled parameter relationship that enables both high acceleration and low substrate shifting.
2Reliability
If dampers are added to reduce vibration, then substrate shifting is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by attaching dampers only to specific locations on the fingers where vibration occurs, rather than redesigning the entire end effector structure. Each damper is locally positioned on individual fingers that experience vibration, creating a targeted solution that minimizes overall structural complexity while effectively addressing the vibration problem at its source.
Solution Approach 2:
The patent creates a composite structure by combining the original finger material with damper materials having different mechanical properties. This composite approach allows the finger-damper assembly to exhibit both the structural integrity needed for substrate support and the vibrational damping characteristics needed to reduce substrate shifting, without requiring a complete redesign of the finger structure.
3Reliability
If dampers are added to reduce vibration, then substrate shifting is reduced, but weight increases
Solution Approach 1:
The patent applies partial action by attaching dampers only to the specific fingers that experience vibration during operation, rather than adding weight to the entire end effector structure. This selective approach provides vibration damping where needed while minimizing unnecessary weight addition, as only the affected fingers receive damper attachments proportional to their vibrational exposure.
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
The self-damping end effectors effectively mitigate substrate shifting and enable faster substrate handling, improving throughput by reducing vibrational amplitudes and maintaining operational efficiency.
Implementation Method 1
the damper having a natural frequency within a predetermined tolerance of a natural frequency of the finger
Implementation Method 2
a damper associated with the finger, the damper having a natural frequency within a predetermined tolerance of a natural frequency of the finger
Data Source
AI summary
A self-damping end effector including a base, a finger extending from the base and adapted to support a substrate, and a damper associated with the finger, the damper having a natural frequency within a predetermined tolerance of a natural frequency of the finger.