CMP Polishing Pad Change Using Vacuum Platen Automation
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Solution Overview
Problem
CMP systems are labor-intensive due to frequent manual polishing pad changes, which are time-consuming and pose safety and contamination risks.
Innovation Solution
An automated pad change system for CMP systems, featuring a platen with apertures for vacuum hold and a pad handler, allows for automated installation and removal of polishing pads using a vacuum pump and rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual pad change process is used, then labor flexibility is maintained, but productivity decreases and safety risks increase
Solution Approach 1:
The system enables automated self-service pad changes where the pad handler automatically removes depleted pads and installs fresh pads without human intervention. The vacuum system automatically secures pads to the platen, creating a self-sufficient automated change process that eliminates manual labor while maintaining high productivity
Solution Approach 2:
The patent replaces manual mechanical operations with an automated pad handler system that uses robotic mechanisms for pad removal and installation. The vacuum system replaces manual securing operations with automated atmospheric pressure control, substituting human mechanical actions with automated mechanical and pneumatic systems
2Reliability
If frequent pad changes are performed manually, then polishing quality is maintained, but time consumption increases
Solution Approach 1:
The system performs preliminary actions by pre-positioning fresh pads in the pad handler ready for immediate installation. The automated system has pads prepared in advance, eliminating the time required for manual pad preparation and handling during change operations, allowing rapid substitution while maintaining quality
Solution Approach 2:
The automated pad change system enables continuous operation by minimizing interruption time between polishing tasks. The rapid automated exchange of pads ensures that the polishing process can resume immediately without significant downtime, maintaining continuous useful action and preventing quality degradation from extended idle periods
3Ease of operation
If manual pad handling is used, then operational simplicity is maintained, but safety risks and contamination increase
Solution Approach 1:
The pad handler serves as an intermediary between the operator and the polishing pads, performing all hazardous handling operations automatically. This intermediary system eliminates direct human contact with potentially contaminated or dangerous materials, reducing safety risks and contamination while maintaining operational simplicity through centralized automated control
Solution Approach 2:
The system extracts the dangerous and contaminating elements of pad handling from the human operator and transfers them to the automated pad handler. By removing manual manipulation of pads entirely, the system eliminates safety risks associated with manual handling and contamination risks from human contact, while keeping the control interface simple for operators
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
Automated pad changes increase throughput, reduce labor, and minimize safety incidents and contamination in semiconductor manufacturing.
Implementation Method 1
a vacuum arranged to selectively apply a vacuum within the plurality of apertures so as to hold the pad to the pad mounting surface
Data Source
AI summary
A system, controller, and method of automatically changing a polishing pad of a chemical mechanical polishing (CMP) system are provided. In one aspect, a CMP system includes a platen having a pad mounting surface upon which a pad, or replacement pad, can be disposed. The platen forms a plurality of apertures that extend to the pad mounting surface. The CMP system also includes a pad handler arranged to selectively move a pad onto the pad mounting surface during a pad installation process, and to selectively move the pad from the pad mounting surface during a pad removal process. The CMP system further includes a vacuum pump arranged to selectively apply a vacuum within the plurality of apertures so as to hold the pad to the pad mounting surface, such as during CMP processing of a substrate. The vacuum pump can cease applying the vacuum during an automated pad change process.