Sealed Drive Rail Magnetic Coupling for Wafer Carrier
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Solution Overview
Problem
In semiconductor wafer processing, existing wafer movement mechanisms risk generating metallic residues or particulates that can damage the wafer, particularly during aggressive chemical processing operations.
Innovation Solution
A magnetic coupling system is employed within a sealed drive rail to move a semiconductor wafer carrier, using a first magnetic member within the rail's interior cavity and a second magnetic member affixed to the carrier, ensuring controlled linear movement while minimizing exposure to processing solutions and preventing particulate generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a magnetic coupling system is used to move the wafer carrier, then metallic residue generation is prevented, but device complexity increases due to the sealed drive rail and magnetic members
Solution Approach 1:
The patent replaces traditional mechanical contact-based drive mechanisms with a magnetic coupling system. The drive mechanism uses magnetic fields to transmit force through the sealed drive rail wall, eliminating the need for direct mechanical contact between moving parts and the wafer carrier. This substitution prevents metallic residue generation while achieving the required wafer carrier movement.
Solution Approach 2:
The sealed drive rail wall acts as an intermediary barrier between the drive mechanism and the wafer carrier. The magnetic field penetrates this barrier to transmit force, allowing the drive mechanism to move the wafer carrier without direct contact. This intermediary structure prevents contamination while enabling force transmission.
2Object-generated harmful factors
If a sealed drive rail is used to prevent particulate generation, then wafer protection is improved, but manufacturing precision may be compromised due to sealing requirements
Solution Approach 1:
The magnetic coupling system eliminates the need for mechanical seals or contact points that could generate particulates. The magnetic field penetrates the sealed drive rail wall without requiring physical openings or contact, maintaining the seal integrity while enabling precise wafer carrier movement and positioning.
3Ease of operation
If magnetic members are disposed within the interior cavity of the drive rail, then wafer carrier movement is achieved, but the drive mechanism complexity increases
Solution Approach 1:
The magnetic coupling system uses the magnetic field's inherent ability to penetrate non-magnetic materials (the drive rail wall) to transmit force. The drive mechanism leverages this property to move the wafer carrier without requiring complex transmission components, reducing overall mechanism complexity while maintaining ease of operation.
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 effectively moves semiconductor wafers without generating metallic residues, protecting the wafer from damage and maintaining a clean processing environment by using magnetic coupling to transfer the carrier along the drive rail, ensuring precise and residue-free handling.
Implementation Method 1
The first magnetic member is configured to magnetically couple through the exterior drive surface to a wafer carrier disposed adjacent to the exterior drive surface
Data Source
AI summary
A drive rail includes a sealed interior cavity and an exterior drive surface that extends along a length of the drive rail. A first magnetic member is disposed within the interior cavity and adjacent to a surface of the interior cavity that is immediately opposite the exterior drive surface. A drive mechanism is disposed within the interior cavity and in connection with the first magnetic member, and is configured to move the first magnetic member within the interior cavity along the length of the drive rail, such that the first magnetic member remains immediately opposite the exterior drive surface. The first magnetic member is configured to magnetically couple through the exterior drive surface to a wafer carrier disposed adjacent to the exterior drive surface. Movement of the first magnetic member within the interior cavity along the drive rail causes corresponding movement of the wafer carrier along the exterior drive surface.