Multi-End-Effector Traversing Robot for Flexible Wafer Transfer
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Solution Overview
Problem
Modern semiconductor manufacturing factories face challenges in achieving a compact footprint, high productivity, and flexible wafer handling capabilities, particularly in systems with limited space and vacuum environments.
Innovation Solution
A traversing robot with multiple end-effectors is designed to traverse a stationary base along a motion path, featuring a movable arm assembly with pivoting bases and linkages, allowing independent and simultaneous movement of substrates into or from substrate workstations, and equipped with rotary joints for coaxial alignment and power/communication couplings to facilitate efficient wafer handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a robot system is designed to handle multiple wafers simultaneously to improve productivity, then the number of wafers processed per unit time increases, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple end-effectors (first and second end-effectors with substrate holding areas) onto a single movable robot platform, allowing simultaneous handling of multiple wafers. This merging approach increases productivity while avoiding the need for separate robot systems for each wafer, thus managing device complexity through integration rather than multiplication of independent systems.
Solution Approach 2:
The robot platform is designed with universal capability to perform multiple functions: it can independently control multiple end-effectors, traverse along the motion path in both directions, and transfer wafers to different substrate workstations. This multi-functionality allows a single system to handle various wafer processing tasks simultaneously, improving productivity without proportionally increasing overall system complexity.
2Adaptability or versatility
If the robot traverses in two opposing directions along the motion path, then flexibility in wafer flow is improved, but the control complexity increases
Solution Approach 1:
The robot platform is designed with dynamic traversal capability, able to move bidirectionally along the motion path between substrate workstations. This dynamic motion control allows the system to adapt to different wafer flow requirements and process sequences, improving versatility. The bidirectional movement is managed through coordinated control of the drive mechanism, which integrates with the end-effector control to maintain overall system coordination without excessive complexity.
3Productivity
If multiple end-effectors are mounted on the robot platform, then the ability to handle multiple substrates simultaneously is improved, but the manufacturing complexity increases
Solution Approach 1:
The robot system is segmented into distinct functional modules: the movable platform, multiple independent end-effectors (each with substrate holding areas), the pivoting arm assembly, and the drive mechanism. This segmentation allows each component to be manufactured and tested independently, then assembled into the complete system. The modular approach reduces manufacturing complexity compared to designing a monolithic multi-functional robot, while still enabling simultaneous handling of multiple substrates through the coordinated operation of segmented end-effectors.
Data Source
AI summary
An apparatus includes a platform configured to traverse a stationary base along a motion path; a drive coupled to the platform; and a movable arm assembly. The movable arm assembly includes a pivoting base connected to the drive, first and second linkages connected to the pivoting base, each linkage having links connected via rotary joints and each link having at least one end-effector. The platform is configured to traverse the stationary base along a motion path in two opposing directions and the drive and the movable arm assembly are configured to cause independent and simultaneous movement and transfer of substrates from at least one of a first substrate holding area, a second substrate holding area, a third substrate holding area, or a fourth substrate holding area into or from a respective substrate workstation.