CMP Gimbal Conditioning Disks for Pad Reconditioning
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Solution Overview
Problem
Current chemical mechanical polishing (CMP) systems face inefficiencies due to worn polishing pads, which lead to longer processing times and uneven polishing, as existing reconditioning methods lack proper contact between conditioning disks and the polishing pad.
Innovation Solution
A pad conditioning system featuring a gimbal with pockets that house conditioning disks, gaskets, and o-rings, allowing for independent movement and even pressure distribution across the polishing pad during reconditioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a worn polishing pad is used in CMP process, then the polishing pad can be reused, but the processing time increases and polishing uniformity deteriorates
Solution Approach 1:
The patent implements a reconditioning system that recovers worn polishing pads by removing material from their surface using conditioning disks. This allows the pads to be restored to a usable state rather than discarded, directly addressing the contradiction by extending pad life (improving productivity) while maintaining polishing quality (preserving reliability).
Solution Approach 2:
The system enables self-service reconditioning where the conditioning apparatus automatically restores the polishing pad surface without requiring manual intervention or replacement. The automated material removal process maintains consistent results, ensuring both time efficiency and polishing uniformity are preserved.
2Ease of repair
If existing reconditioning methods are used, then polishing pads can be partially reconditioned, but proper contact between conditioning disk and polishing pad is not achieved
Solution Approach 1:
The conditioning apparatus divides the conditioning function into multiple independent conditioning disks arranged in a gimbal structure. Each disk can independently contact and condition different zones of the polishing pad, ensuring comprehensive coverage and proper contact throughout the pad surface, thereby improving manufacturing precision while maintaining ease of repair.
Solution Approach 2:
The gimbal structure allows the conditioning disks to dynamically adjust their position and orientation relative to the polishing pad surface. This dynamic capability ensures that even if the pad surface is uneven, the disks maintain proper contact, improving both reconditioning capability and contact quality simultaneously.
3Device complexity
If conditioning disks are fixed in position, then the structure is simple, but even pressure distribution across the polishing pad cannot be achieved
Solution Approach 1:
The conditioning disks are mounted on a gimbal structure that allows them to move and rotate independently. This dynamic mounting enables the disks to self-adjust to the polishing pad surface contours, distributing pressure evenly across the pad without requiring complex active control systems, thus achieving uniform pressure distribution while keeping the structure relatively simple.
Solution Approach 2:
The system changes the positional parameters of the conditioning disks dynamically during operation. The gimbal mechanism allows the disks to vary their angle and position relative to the pad surface, automatically adapting to maintain even pressure distribution. This parameter adjustment capability achieves manufacturing precision without proportionally increasing device complexity.
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 system effectively reconditions polishing pads by maintaining even pressure and reducing hot and cold spots, leading to more efficient CMP processes and improved semiconductor product consistency.
Implementation Method 1
each gasket and each o-ring are compressible during a reconditioning process, allowing each of the plurality of conditioning disks to move within a respective one of the plurality of pockets
Implementation Method 2
reconditioning the polishing pad at least in part by removing material from the polishing pad by the conditioning disks
Data Source
AI summary
A system may include a gimbal defining a plurality of pockets, where each pocket may include a first portion and a second portion that extends between the first portion and a base of the pocket. The second portion may have a greater diameter than the first portion. The system may include a plurality of conditioning disks, where each conditioning disk is seated within the first portion of a respective pocket. The system may include a plurality of gaskets, where each gasket is seated within the second portion of a respective pocket. The system may include a plurality o-rings, each o-ring disposed between a peripheral edge of one of the plurality of conditioning disks and a lateral wall of one of the plurality of pockets. The system may include a plurality of shoulder screws for coupling the gimbal with one of the plurality of gaskets and a conditioning disk.