Adjustable Buffer Tanks for CMP Pressure Regulator Consistency
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Solution Overview
Problem
Chemical mechanical polishing (CMP) devices face variations in responsiveness of pressure regulators due to differing lengths of gas transfer lines and volumes of pressure chambers, affecting precise polishing control.
Innovation Solution
A polishing device with adjustable buffer tanks and a control device that adjusts the volume of these tanks based on pressure sensor readings to ensure the change in secondary side pressure falls within a predetermined range, thereby optimizing the control parameters for pressure regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gas transfer lines have different lengths and pressure chambers have different volumes, then the polishing device can accommodate varying polishing requirements, but the responsiveness of pressure regulators varies
Solution Approach 1:
The patent introduces buffer tanks with different volumes corresponding to different pressure chambers. Each buffer tank's volume is specifically designed to compensate for the characteristics of its associated pressure chamber and gas transfer line, creating local optimization rather than uniform treatment. This resolves the contradiction by allowing each subsystem to be tailored to its specific requirements while maintaining overall system consistency.
Solution Approach 2:
The patent changes the volume parameter of buffer tanks to adjust the responsiveness of pressure regulators. By varying the buffer tank volume as a key parameter, the system can compensate for differences in gas transfer line lengths and pressure chamber volumes, ensuring consistent responsiveness across all pressure regulators despite varying physical configurations.
2Stability of the object's composition
If buffer tank volume is increased to reduce pressure fluctuations, then pressure stability improves, but responsiveness to pressure changes decreases
Solution Approach 1:
The patent makes the buffer tank volume dynamic rather than fixed. The volume adjustment device allows the buffer tank volume to be changed based on operating conditions, enabling the system to optimize between pressure stability and responsiveness as needed. This dynamic adjustment resolves the contradiction by allowing the system to adapt its characteristics to different operational requirements.
Solution Approach 2:
The patent performs preliminary adjustment of buffer tank volumes before operation to optimize system performance. By pre-configuring the appropriate buffer tank volumes for different pressure chambers, the system is prepared to achieve both stability and responsiveness when needed, rather than having to compromise between the two during operation.
3Ease of operation
If multiple pressure regulators are used with different gas transfer line lengths, then individual pressure control is achieved, but variations in responsiveness occur
Solution Approach 1:
The patent applies local quality by providing each pressure regulator with a dedicated buffer tank of specifically designed volume. This allows each regulator to be optimized for its particular gas transfer line length and pressure chamber characteristics, maintaining individual control capability while ensuring uniform responsiveness across all regulators through localized compensation.
Data Source
AI summary
A polishing device is capable of reducing variations in responsiveness of multiple pressure regulators. The polishing device includes multiple buffer tanks T1 to T6. Each of the buffer tanks T1 to T6 includes a tank section 120 made of a rigid body and a volume adjustment device 122 which adjusts a volume of the buffer tank.