Arcuate Shoulder Blade for High-Temperature Substrate Extraction
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Solution Overview
Problem
Current substrate transfer blades in high-temperature processing systems cause thermal stress, leading to substrate breakage and warping, limiting extraction temperatures to 550°C and reducing substrate throughput.
Innovation Solution
A blade design with minimized surface area under the substrate and reduced edge contact, featuring an arcuate lateral shoulder and support tabs to minimize thermal stress and facilitate faster cooling, allowing for higher temperature extraction while reducing particle contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flat blade surface with significant material area is used to support the substrate, then the substrate is well-supported during transfer, but thermal stress on the substrate increases due to slow cooling
Solution Approach 1:
The blade surface is segmented into discrete support regions (protrusions) rather than a continuous flat surface. This segmentation reduces the total contact area between the blade and substrate, allowing heat to dissipate more rapidly from the substrate while maintaining adequate mechanical support at key locations.
Solution Approach 2:
The blade design implements local quality by providing support only at specific locations (protrusions) rather than across the entire substrate surface. This localized support approach maintains structural integrity where needed while minimizing thermal contact area to reduce thermal stress and accelerate cooling.
2Stress or pressure
If the blade material area under the substrate is reduced for faster cooling, then thermal stress is reduced, but substrate support and handling stability deteriorate
Solution Approach 1:
The support function is segmented into multiple discrete protrusions distributed across the blade surface. This segmentation allows the total support area to be minimized for thermal reasons while maintaining adequate mechanical support through strategically positioned contact points that ensure handling stability.
Solution Approach 2:
The blade design incorporates preliminary cooling action by minimizing thermal contact area from the outset. The protrusion geometry is designed to facilitate rapid heat transfer to the blade while maintaining support, enabling the substrate to cool quickly during the transfer process before entering the cooling station.
3Object-generated harmful factors
If edge contact between blade and substrate is reduced to minimize particle contamination, then particle contamination decreases, but substrate support during transfer is compromised
Solution Approach 1:
The continuous edge contact is segmented into discrete protrusion elements. This segmentation eliminates the long-edge contact that generates particles while maintaining substrate support through multiple localized contact points. The protrusions provide sufficient mechanical support without the friction and particle generation associated with edge-to-edge contact.
Solution Approach 2:
The harmful edge contact function is extracted from the blade design. Instead of relying on edge-to-edge contact for support, the invention uses protrusions that contact the substrate at discrete locations away from the edges, thereby eliminating the particle generation mechanism while preserving the essential support function.
4Reliability
If extraction temperature is limited to 550°C to prevent substrate damage, then substrate breakage and warping are minimized, but substrate throughput and processing efficiency are reduced
Solution Approach 1:
The blade geometry parameters are changed from a continuous flat surface to discrete protrusions with optimized dimensions and spacing. This parameter change enables extraction temperatures above 550°C by facilitating rapid cooling that prevents substrate damage even at higher temperatures, thereby increasing throughput without compromising substrate integrity.
Solution Approach 2:
The invention converts the potentially harmful rapid cooling effect (which could cause thermal shock) into a beneficial feature. By designing protrusions that facilitate controlled rapid cooling, the system can operate at higher extraction temperatures while using the quick cooling to prevent substrate damage, thus converting what could be a harmful thermal shock into a protective mechanism that enables higher throughput.
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
Enables extraction temperatures greater than 550°C with reduced substrate breakage and warping, resulting in increased throughput and lower processing times, thereby reducing the cost of ownership.
Implementation Method 1
The significant amount of material of the flat blade surface 110 under the hot substrate slows the cooling of the substrate and the prior art blade 100
Data Source
AI summary
An apparatus for transferring substrates in a processing system where the substrate is exposed to high temperatures is provided. In one embodiment a blade for transporting a substrate is provided. The blade comprises a base having an arcuate lateral shoulder, a first finger extending outward from and perpendicular to the base, a second finger extending outward from the base and parallel to and spaced-apart from the first finger, a first support tab configured to support the substrate and positioned along the arcuate lateral shoulder, a second support tab configured to support the substrate and coupled with the first finger, and a third support tab configured to support the substrate coupled with the second finger, wherein the arcuate lateral shoulder extends from an outer edge of the first finger to an outer edge of the second finger.