CMP Roll Brush Distance Adjustment for Wear Management
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Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face challenges in extending the lifetime of brushes and minimizing defects, as existing systems do not effectively manage brush wear and contamination over time, leading to increased abrasion and contamination.
Innovation Solution
A CMP apparatus and method that includes a controlling unit to adjust the distance between roll brushes based on usage time, with different rates for different slurries and periodic compression of brushes to maintain effectiveness and prevent defects, utilizing a cleaning solution nozzle to enhance cleaning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between roll brushes is kept constant, then the结构简单性 is maintained, but the brush lifetime decreases and defects increase due to wear and contamination
Solution Approach 1:
The patent applies dynamics by making the distance between roll brushes adjustable rather than fixed. The controlling unit dynamically changes the distance based on usage time and slurry type, allowing the system to adapt to brush wear and contamination conditions. This resolves the contradiction by enabling brush lifetime extension through parameter adjustment while accepting the necessary complexity of a distance control mechanism.
Solution Approach 2:
The patent changes the physical parameter of brush distance based on usage time and slurry characteristics. By reducing the distance between brushes over time, the system compensates for brush wear and maintains effective cleaning pressure. This parameter change approach directly addresses the contradiction by extending brush lifetime through adaptive distance adjustment.
2Reliability
If the cleaning solution flow rate is increased continuously, then the cleaning effectiveness improves, but the water consumption and cost increase
Solution Approach 1:
The patent applies periodic action by temporarily increasing the cleaning solution flow rate only during initial brush usage periods. After this initial period, the flow rate returns to normal levels. This periodic enhancement ensures effective cleaning during the critical early phase when brushes are most effective, while avoiding excessive water consumption during later periods, thus resolving the contradiction between cleaning effectiveness and water usage.
Solution Approach 2:
The patent performs preliminary action by providing enhanced cleaning solution flow at the beginning of brush operation. This preliminary enhancement prepares the system for optimal performance during the initial phase, after which normal flow rates suffice. This approach ensures cleaning effectiveness is established early while minimizing overall water consumption.
3Manufacturing precision
If the distance between roll brushes is reduced continuously, then the brush pressure and cleaning effectiveness improve, but the brush wear increases
Solution Approach 1:
The patent applies dynamics by making the brush distance adjustable based on usage time. The system dynamically reduces distance only after certain usage periods, rather than maintaining constant reduced distance. This allows the system to achieve good substrate planarity when needed while preserving brush lifetime by avoiding continuous high-pressure contact.
Solution Approach 2:
The patent applies periodic action by reducing the distance between brushes only at specific intervals based on usage time. This periodic compression provides sufficient pressure for substrate planarity while allowing brush recovery periods, thus extending brush lifetime. The contradiction is resolved by timing the distance reduction to coincide with usage milestones rather than maintaining continuous reduced distance.
4Manufacturing precision
If different slurries are used for different polishing targets, then the polishing quality improves, but the system complexity and slurry management increases
Solution Approach 1:
The patent applies universality by designing the brush distance adjustment mechanism to work with multiple slurry types. The same controlling unit and distance adjustment system handle both silica-based and hydrogen peroxide-based slurries, adapting the brush distance based on slurry characteristics. This multi-functionality approach enables high-quality polishing with different slurries while avoiding the need for separate dedicated systems for each slurry type.
Data Source
AI summary
A chemical mechanical polishing apparatus includes a cleaning unit that cleans a substrate, a brushing unit that includes a plurality of roll brushes brushing the substrate and a driver driving the roll brushes, and a controlling unit that controls the driver. The controlling unit includes a time calculator that counts a usage time of the roll brushes, and a drive controller that reduces a distance between the roll brushes, based on the usage time of the roll brushes.