SCARA Substrate Transfer Layout for Low-Particle Wafer Handling
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Solution Overview
Problem
Existing substrate transfer mechanisms in semiconductor processing apparatuses face challenges in accurately and efficiently transferring wafers between multiple stacked processing modules, leading to potential particle adhesion and reduced yield due to structural complexity and particle scattering during movement.
Innovation Solution
A substrate transfer mechanism featuring a SCARA-type arm configuration with a lift system, pivotable arms, and a substrate holder, which reduces structural thickness and minimizes particle adhesion by routing cables and power transmission mechanisms internally and using exhaust mechanisms to maintain a clean transfer environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-joint substrate transfer mechanism with stacked arms is used, then the substrate can be delivered to multiple processing modules, but the structural thickness increases and particles may adhere to the substrate
Solution Approach 1:
The patent transitions from a vertical stacking arrangement of arms to a horizontal planar configuration where arms are arranged side-by-side rather than stacked. This dimensional change reduces the vertical thickness of the structure while maintaining the capability to serve multiple processing modules through horizontal extension and rotational movement.
2Ease of operation
If arms are stacked in sequence, then the mechanism can achieve complex motion, but particles scatter during movement reducing transfer accuracy
Solution Approach 1:
The patent extracts the power transmission mechanisms and cable routing from the external environment and places them inside the arm structures. This extraction eliminates external cables and mechanical linkages that could generate particles, thereby improving transfer accuracy while maintaining complex motion capability through internal actuation systems.
3Ease of operation
If external cables and power transmission mechanisms are used, then the arms can be actuated, but particles are generated during substrate transfer
Solution Approach 1:
The patent implements nesting by placing power transmission mechanisms, motors, and cable routing systems inside the arm structures themselves. This nested configuration eliminates external mechanical linkages and exposes no moving parts to the cleanroom environment, thereby preventing particle generation while maintaining full actuation capability.
4Stability of the object's composition
If a thicker structural design is used, then the mechanism is more stable, but the module layout flexibility is reduced
Solution Approach 1:
The patent achieves stability without increased thickness by utilizing horizontal spatial arrangement and rotational degrees of freedom. The arms are positioned side-by-side in a planar configuration with optimized moment of inertia, allowing stable operation while maintaining a thin vertical profile that provides layout flexibility.
Data Source
AI summary
A substrate transfer mechanism includes: an arm base main body provided with a first driver; a lift configured to move up and down the arm base main body; a first arm extending transversely from a lower side of the arm base main body, and having a tip end that pivots around a vertical axis with respect to the arm base main body by the first driver; a second arm extending transversely from an upper side of the tip end of the first arm, and having a tip end that pivots around a vertical axis with respect to the first arm along with the pivoting of the first arm; and a substrate holder provided on an upper side of the tip end of the second arm, and configured to rotate around a vertical axis with respect to the second arm.