CMP Conditioner Flexible Air Bag Connection
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Solution Overview
Problem
Existing chemical mechanical polishing (CMP) apparatuses face challenges in efficiently conditioning polishing pads due to direct vertical loads and frictional moments, leading to reduced durability and suboptimal polishing performance.
Innovation Solution
A conditioner with a flexible connection unit between the arm and conditioning unit, forming an air bag to allow relative movement and reduce vertical loads, combined with a sensor to measure tilted angles and an air-supplying unit to control stiffness, ensuring uniform pressure and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible connection unit is used to allow relative movement between the arm and conditioning unit, then the durability of the connection unit is improved, but the structural complexity increases
Solution Approach 1:
The patent introduces an air bag as an intermediary element between the arm and conditioning unit. This air bag acts as a mediator that enables relative movement while distributing mechanical stresses, thereby improving durability without requiring complex mechanical linkages or multiple moving parts. The air cushion provides a simple yet effective solution for accommodating movements and reducing wear on connection components.
2Manufacturing precision
If direct vertical loads are applied to the conditioning unit, then the polishing performance is maintained, but the durability of the connection unit deteriorates
Solution Approach 1:
The patent implements an air bag that provides cushioning before vertical loads are fully transmitted to the connection unit. This pre-cushioning mechanism absorbs shock and distributes vertical loads, preventing concentrated stresses that would otherwise accelerate wear and failure of the flexible connection unit while maintaining sufficient contact pressure for effective polishing.
3Device complexity
If the conditioning unit is rigidly connected to the arm, then the structural simplicity is maintained, but the ability to maintain uniform pressure deteriorates
Solution Approach 1:
The patent transitions from a rigid connection to a dynamic, flexible connection using an air bag. This flexible connection allows the conditioning unit to dynamically adjust its position and orientation in response to variations in the polishing pad surface. The air cushion enables continuous adaptation to maintain uniform pressure distribution across the conditioning interface, accommodating movements and tilts that a rigid structure cannot absorb.
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 solution enhances the durability of the flexible connection unit, reduces pressure loss on the polishing pad, and improves conditioning and polishing performance by maintaining uniform contact and pressure distribution.
Implementation Method 1
The flexible connection unit may form an air bag between the arm unit and the conditioning unit
Implementation Method 2
The sensor unit may be configured to measure a tilted angle of the conditioning unit with respect to the arm unit
Data Source
AI summary
A conditioner of a chemical mechanical polishing (CMP) apparatus includes a conditioning part to polish a polishing pad, an arm to rotate the conditioning part, and a flexible connector connecting the conditioning part with the arm, the flexible connector being moveable to allow relative movements of the conditioning part with respect to the arm.