Narrow Loadport Mechanism for Semiconductor Tool Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional loadport mechanisms are too wide to align with the centerlines of smaller process tools, restricting throughput and requiring additional space and complex configurations, which limits the efficiency and flexibility in semiconductor manufacturing.
Innovation Solution
A narrowed loadport design with a centrally located tower enclosure and motors, allowing vertical and horizontal movement of the articulating arm and mini environment, reducing the overall width and footprint while maintaining cleanliness and reliability, enabling alignment with narrower process tool cassette locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional loadport mechanisms are used, then they can transport substrates between tools, but they are too wide to align with the centerlines of smaller process tools, restricting throughput and requiring additional space
Solution Approach 1:
The patent relocates the motor assemblies from horizontal side-mounting to a vertical tower structure positioned at the centerline of the loadport. This dimensional reconfiguration allows the drive mechanisms to be arranged vertically rather than horizontally, reducing the loadport width to match narrower process tool cassette locations while maintaining all necessary motor functions for articulating arm movement and mini environment positioning.
Solution Approach 2:
The tower enclosure is designed to house multiple motor assemblies (first motor for mini environment vertical movement, second motor for articulating arm vertical movement, third motor for articulating arm horizontal movement) in a centralized location. This preliminary arrangement of drive mechanisms in the tower structure enables the loadport to achieve narrow width while maintaining full functionality for substrate transport and tool alignment.
2Productivity
If the loadport width is reduced to match narrower process tool cassette locations, then alignment and throughput are improved, but the space available for motor assemblies and other components is reduced
Solution Approach 1:
The patent transitions from horizontal space utilization to vertical space utilization by positioning motor assemblies in a central tower structure. The first motor is positioned to move the mini environment vertically, the second motor moves the articulating arm vertically, and the third motor moves the articulating arm horizontally. This vertical arrangement accommodates all motor assemblies within the narrow width while maintaining full functionality and improving throughput.
Solution Approach 2:
The patent consolidates multiple motor assemblies (first motor, second motor, third motor) and support structures into a single centralized tower enclosure positioned at the loadport centerline. This merging of components into a compact vertical structure reduces the horizontal footprint while providing sufficient volume for all drive mechanisms, thereby enabling narrow width design that matches process tool cassette locations and improves productivity.
3Reliability
If motors are enclosed in a tower enclosure separate from the mini environment, then cleanliness is maintained, but the structural complexity increases
Solution Approach 1:
The patent divides the loadport structure into distinct sealed zones: the mini environment (maintaining class 1 clean room standards with filter assembly and fan) and the tower enclosure (housing motor assemblies separate from the clean environment). This segmentation isolates potential contamination sources in the tower from the mini environment, maintaining cleanliness and reliability while the modular design manages structural complexity through clear functional separation.
Solution Approach 2:
The tower enclosure acts as an intermediary structure that houses motor assemblies and supports the mini environment without compromising the clean room standards. The enclosure provides a protected space for mechanical components while the filter assembly and fan maintain positive pressure and airflow control to prevent contamination, thereby balancing structural requirements with cleanliness protection.
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 narrowed loadport design increases throughput, reduces cycle time, and minimizes the need for mirror image configurations, enhancing stability and compatibility with existing systems while maintaining cleanliness and reliability.
Implementation Method 1
The mini environment can include a filter assembly and a first fan coupled to the filter assembly for directing air though the filter assembly and into the mini environment
Implementation Method 2
The tower enclosure can includes a second fan for drawing air out of the tower enclosure to an external environment. The second fan draws air through the second fan and out of the tower enclosure in a downward direction
Data Source
AI summary
A system and method of transporting substrates includes a loadport system including a frame, an articulating arm, a mini environment and a tower substantially centered in the frame. The tower includes multiple motors, a first motor mechanically coupled to the mini environment for moving the mini environment vertically. A second motors mechanically coupled to the articulating arm for moving the articulating arm vertically. A tower enclosure is also included. The tower enclosure enclosing the motors separate from the mini environment.