Spiral Cam Horizontal Displacement Mechanism for Cleanroom Loadports
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Solution Overview
Problem
Conventional loadport systems in semiconductor manufacturing are unable to provide horizontal displacement of pods or substrates, limiting their ability to move objects in a cleanroom environment without contaminating sensitive materials.
Innovation Solution
The implementation of a spiral cam apparatus with a tubular shape and cam contour, combined with a linear slide assembly and cam roller, allows for horizontal movement of a loadport system by rotating the spiral cam along a rotational axis, enabling the transfer of substrates between different stages while maintaining a clean environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional loadport system is used, then the structure is simple and easy to manufacture, but it cannot provide horizontal displacement of pods or substrates
Solution Approach 1:
The patent applies the dynamics principle by implementing a movable linear slide assembly that can rotate about a rotational axis. This rotation converts vertical motion into horizontal displacement through the spiral cam mechanism, enabling the loadport to dynamically adapt and provide horizontal movement capability that was previously absent in conventional static systems.
Solution Approach 2:
The patent employs dimensionality change by introducing a rotational degree of freedom about a horizontal axis. The linear slide assembly rotates to convert vertical motion (one dimension) into horizontal displacement (another dimension), effectively adding movement capability in a new spatial dimension without fundamentally redesigning the entire system.
2Ease of operation
If the linear slide assembly and spiral cam are rotated in unison, then horizontal movement is achieved, but the mechanism complexity increases
Solution Approach 1:
The patent applies merging by combining the linear slide assembly and spiral cam into a unified rotating mechanism. Both components rotate in unison about the same rotational axis, eliminating the need for separate actuation systems and reducing operational complexity despite the increased mechanical structure.
Solution Approach 2:
The spiral cam acts as an intermediary mechanism that mediates between the rotation of the linear slide assembly and the generation of horizontal displacement. It converts the rotational motion into controlled horizontal movement of the pod, simplifying the control operation while managing the mechanical complexity.
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
This solution enables efficient horizontal displacement of substrates within a cleanroom, enhancing the capability to transfer sensitive materials between tool stages without contamination, improving the operational efficiency and cleanliness of semiconductor fabrication processes.
Implementation Method 1
The cam roller is defined to engage with the cam contour of the spiral cam to cause movement of the spiral cam along the rotational axis when the linear slide assembly and spiral cam are rotated in unison about the rotational axis relative to the cam roller
Data Source
AI summary
A spiral cam has a tubular shaped portion defined by an interior cavity and an exterior surface that includes a cam contour. A linear slide assembly having a length defined along a rotational axis is defined to slide lengthwise into the interior cavity of the spiral cam. The linear slide assembly allows for movement of the spiral cam along the rotational axis and prevents rotation of the spiral cam relative to the linear slide assembly. A cam roller is fixed at a position proximate to the exterior surface of the spiral cam. The cam roller is disposed separate from the linear slide assembly and within the cam contour of the spiral cam. The cam roller engages the cam contour to move of the spiral cam along the rotational axis when the linear slide assembly and spiral cam are rotated in unison about the rotational axis relative to the cam roller.