Wafer Container Robotic Flange Deflection Control
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Solution Overview
Problem
The increased size and weight of larger diameter semiconductor wafers, such as 450 mm wafers, pose challenges in handling and storage due to flexing of plastic container materials, compromising sealing and wafer support, and requiring improved structural rigidity and sealing characteristics to prevent contamination and damage.
Innovation Solution
A front opening wafer container design featuring a removable robotic flange with detents and upwardly extending strengthening ribs that distribute load evenly across the container, minimizing deflection and enhancing sealing, while maintaining cleanliness and support for larger wafers during robotic handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the container size is increased to accommodate larger diameter wafers (450 mm), then the wafer support capability is improved, but the container material flexing increases causing sealing compromise and wafer support distortion
Solution Approach 1:
The container is segmented into multiple structural components including a container portion, door, door frame, and multiple strengthening ribs. This segmentation allows each component to be optimized independently - the strengthening ribs provide localized reinforcement without requiring the entire container structure to be thicker or heavier, thus maintaining rigidity while accommodating larger wafer sizes.
Solution Approach 2:
Strengthening ribs are strategically positioned at specific locations where stress and flexing are most critical - particularly at the periphery of the top wall and along the door frame. This local reinforcement provides the necessary rigidity to prevent sealing compromise and wafer support distortion only where needed, rather than uniformly throughout the entire container structure.
2Object-generated harmful factors
If plastic materials are used to avoid metal fasteners and maintain cleanliness, then particle generation is reduced, but structural rigidity and load-bearing capability deteriorate under increased wafer weight
Solution Approach 1:
The container utilizes plastic materials forming flexible yet structurally adequate shells and walls. By incorporating strengthening ribs into this plastic shell structure, the design maintains the particle-free advantage of plastic materials while compensating for their lower inherent rigidity through strategic structural reinforcement that prevents excessive flexing under load.
Solution Approach 2:
The container employs composite structural design combining plastic materials with integrated strengthening ribs that provide enhanced rigidity. This composite approach allows the base material to remain plastic (avoiding particle generation from metal fasteners) while the rib structures provide the necessary mechanical strength to support increased wafer weights.
3Object-generated harmful factors
If the door and door frame are sealed to prevent contamination, then wafer cleanliness is maintained, but the sealing effectiveness deteriorates when container flexing elongates the door frame shape
Solution Approach 1:
The door frame incorporates strengthening ribs at critical locations where flexing would most affect sealing geometry. This local reinforcement maintains the door frame's shape and dimensional stability specifically in the sealing regions, ensuring that the seal between door and door frame remains effective even when the container bears heavy wafer loads.
Solution Approach 2:
Instead of allowing the door frame to flex and then trying to compensate for the shape change, the design inverts the approach by pre-reinforcing the door frame with strengthening ribs to prevent flexing in the first place. This proactive structural support maintains the original geometry and ensures consistent sealing performance.
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 design reduces deflection by over 75% and ensures secure wafer constraint and improved sealing, addressing the fragility and weight issues of larger wafers, while maintaining the cleanliness and structural integrity of the container.
Implementation Method 1
resilient deflectable portions that horizontally deflect from a retention position to a deflected position
Implementation Method 2
upwardly extending strengthening ribs that distribute load evenly across the container, minimizing deflection
Data Source
AI summary
A front opening wafer container suitable, for large diameter wafers, 300 mm and above, utilizes a removable robotic flange that attaches vertically, without separate fasteners, using detents having resilient bending members that extend vertically to attach to an upwardly extending flange on the top wall of the container portion. A multiplicity of upwardly and outwardly extending strengthening ribs extend upwardly from the top wall of the container portion and extend along the top wall toward the left and right sides and the back side of the container portion, ad each of all four sides of the attachment flange. A further locking piece or core may be inserted and retained at the neck of the robotic flange to lock the resilient deflectable portions in their retention position. The locking piece further may be secured in place with a detent mechanism formed by part of the core and flanges.