Unitary Platen Housing for CMP End Point Detector
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Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face issues with fluid leakage between separate upper and lower platens, leading to damage of components and increased maintenance costs due to corrosion and frequent cleaning requirements.
Innovation Solution
A single-body or unitary platen design that integrates the upper and lower platen structures without gaps, incorporating a seal ring and fasteners to prevent fluid ingress and protect internal components, such as an end point detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate upper and lower platen structures are used, then assembly and disassembly for cleaning is easier, but fluid leakage occurs between the platens causing component damage and increased maintenance
Solution Approach 1:
The patent merges the upper and lower platen structures into a single integrated platen body, eliminating the interface between separate components where fluid leakage occurs. This unified structure maintains fluid tightness while incorporating removable detector access features that enable cleaning operations without requiring separation of upper and lower platens.
2Reliability
If a single-body platen design is used, then fluid leakage is prevented and component protection is improved, but manufacturing complexity increases
Solution Approach 1:
While maintaining a single-body platen structure for fluid tightness, the patent segments the detector housing into removable portions with detector access features. This allows the detection module to be independently accessed and replaced without manufacturing the entire platen as one monolithic piece, thereby reducing manufacturing complexity while preserving the fluid-tight single-body design.
3Ease of repair
If separate upper and lower platens with gaps are used, then component access is easier, but fluid ingress damages internal components increasing maintenance time
Solution Approach 1:
The patent introduces a detector housing as an intermediary structure between the single-body platen and the detection module. This housing can be selectively removed or opened to provide access to the detection module for repair and replacement, while the main single-body platen structure remains intact to prevent fluid ingress. This intermediary design enables component access without compromising the fluid-tight seal of the platen.
Data Source
AI summary
The present disclosure provides a chemical mechanical polishing system having a unitary platen. The platen includes one or more recesses within the platen to house various components for the polishing/planarization process. In one embodiment, the platen includes a first recess and a second recess. The first recess is located under the second recess. An end point detector is placed in the first recess and a detector cover may be placed in the second recess. A sealing mean is provided in a space between the end point detector and the detector cover to prevent any external or foreign materials from coming in contact with the end point detector. A fastener used for fastening the detector cover to the platen also provides addition protection to prevent foreign materials from coming in contact with components received in the recesses.