Showerhead Feature Grouping to Prevent Nonconforming Clusters
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Solution Overview
Problem
Current methods for manufacturing showerheads in substrate processing systems result in clustering of non-conforming features, leading to thickness non-uniformities in processed substrates, and require frequent replacement of cutting attachments, which is costly and onerous.
Innovation Solution
Implementing a method that uses a smaller tolerance subrange and a minimum distance rule to ensure features are uniformly distributed, and a statistical method that accounts for manufacturing variations to maintain feature precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing methods are used for showerheads, then production cost and frequency of cutting attachment replacement are reduced, but non-conforming features cluster together causing thickness non-uniformities in substrates
Solution Approach 1:
The patent segments the features into two categories: conforming features and non-conforming features. By identifying and separating these groups, the method ensures that non-conforming features are distributed uniformly across the substrate rather than clustered together, thereby maintaining thickness uniformity while allowing higher proportion of features to be machined with relaxed tolerances
Solution Approach 2:
The patent applies different quality standards to different locations on the showerhead. Features are evaluated individually to determine conformity, and non-conforming features are strategically distributed. This local quality approach allows the majority of features to be machined within a broader tolerance range while ensuring that no clustered non-conforming features appear in any single region
2Manufacturing precision
If tighter tolerance ranges are applied to all features, then feature precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies the stricter first tolerance range to only the necessary subset of features (those that would become non-conforming and potentially cluster), rather than applying it to all features. This partial application of tight tolerances achieves the required precision while reducing manufacturing complexity and cost compared to universal tight tolerance application
3Manufacturing precision
If cutting attachments are replaced frequently, then feature dimension consistency is maintained, but production time and cost increase
Solution Approach 1:
The patent performs preliminary evaluation of feature conformity during or after machining, identifying which features fall outside the first tolerance range. By pre-identifying non-conforming features and their locations, the method allows the cutting attachment to be used longer without risking clustered non-conformities, thereby reducing replacement frequency while maintaining overall feature consistency
Data Source
AI summary
A method includes selecting first features to be machined within a first tolerance range, and second features, which are located at least a predetermined distance apart, to be machined within a second tolerance range of a specified dimension for the selected features. The method includes machining, using a cutting attachment of a tool, the first features within the first tolerance range, and when a parameter associated with the tool causing variation in dimension of the first selected features reaches a predetermined threshold, machining, using the cutting attachment, the second selected features within the second tolerance range. In a second method, a mean value of dimensions of the first and second features is less than or equal to a predetermined mean deviation from the specified dimension, and a standard deviation of the dimensions of the first and second features is less than or equal to a predetermined standard deviation.