Movable Reaction Chamber for Particle-Free Substrate Loading
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Solution Overview
Problem
Conventional substrate processing reactors with moving parts above the substrate generate particles, affecting deposition quality, and existing solutions are inadequate for certain applications and dimensions.
Innovation Solution
A deposition or cleaning apparatus with a movable reaction chamber that moves vertically, allowing the reaction chamber to be lowered for substrate loading, with moving parts positioned below the substrate to minimize particle generation, using a gastight flexure element like a vacuum bellows for movement, and maintaining a constant distance between the reaction chamber bottom and sidewall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If moving parts are positioned above the substrate for substrate loading, then ease of operation is improved, but particle generation increases affecting deposition quality
Solution Approach 1:
The patent inverts the conventional approach by positioning the moving reaction chamber below the substrate level for loading, rather than having moving parts above the substrate. This inversion allows substrate loading while keeping moving parts away from the substrate, thereby reducing particle generation that would otherwise occur from moving parts positioned above the substrate.
Solution Approach 2:
The patent introduces vertical movement of the reaction chamber along the z-axis, moving the chamber in and out of the substrate processing plane. This dimensional change allows loading operations to occur in a different vertical plane, separating the moving parts from the substrate horizontal plane and eliminating particle contamination.
2Ease of operation
If the reaction chamber is made movable for improved loading, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The reaction chamber is nested within the outer chamber, with the movable reaction chamber fitting inside the stationary outer chamber. This nesting arrangement allows the reaction chamber to move vertically for loading while remaining contained within the outer chamber boundaries, simplifying the overall structure compared to having separate loading and processing chambers.
Solution Approach 2:
The reaction chamber is designed with dynamic movement capability along the vertical axis, transitioning between a lowered position for loading and an elevated processing position. This controlled dynamic movement enables easy substrate loading while maintaining a relatively simple structural design through the use of a bellows mechanism.
3Productivity
If the reaction chamber moves vertically for loading, then productivity is improved, but maintaining pressure consistency becomes more difficult
Solution Approach 1:
The reaction chamber incorporates a bellows structure, which is a flexible element that allows vertical movement while maintaining vacuum integrity. This flexible bellows mechanism enables the chamber to move up and down for loading operations without compromising the pressure environment, as the bellows can expand and contract while maintaining seals.
Solution Approach 2:
The bellows acts as an intermediary element between the movable reaction chamber and the stationary outer chamber, allowing relative movement while maintaining pressure separation. The bellows structure mediates the mechanical movement while preserving the vacuum barrier, enabling productivity improvement without pressure consistency issues.
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 configuration reduces particle formation above the substrate, improves loading efficiency, and maintains a consistent pressure environment, enhancing the cleanliness and effectiveness of substrate processing.
Implementation Method 1
using a gastight flexure element like a vacuum bellows for movement
Data Source
AI summary
A deposition or cleaning apparatus comprising an outer vacuum chamber and a reaction chamber inside the outer chamber forming a double chamber structure. The reaction chamber is configured to move between a processing position and a lowered position inside the outer vacuum chamber, the lowered position being for loading one or more substrates into the reaction chamber.