Quad-Station Foreline Assembly for Easier Chamber Maintenance
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Solution Overview
Problem
Conventional foreline assemblies in semiconductor manufacturing are cumbersome and difficult to service due to crowded lower chamber hardware, especially when pedestal lift orientations are dictated by foreline geometry, making it hard to add new hardware or perform maintenance.
Innovation Solution
A foreline assembly for a quad station process module (QSM) with a unique configuration that includes four inlets, three sections with stepwise diameter increases, T-piece connectors, and symmetrical unions, allowing for improved clearance and ease of maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional foreline assembly configurations are used, then the vacuum evacuation function is provided, but the lower chamber hardware becomes crowded and difficult to service
Solution Approach 1:
The foreline assembly is repositioned from a conventional lower chamber location to an upper chamber location, changing the spatial dimension of the vacuum evacuation system. This dimensional shift removes the foreline from the crowded lower chamber space, thereby improving serviceability of lower chamber hardware while maintaining vacuum evacuation functionality.
Solution Approach 2:
The foreline assembly is extracted from the lower chamber hardware configuration and relocated to the upper chamber. This extraction separates the vacuum evacuation function from the crowded lower chamber components, eliminating the interference between foreline geometry and pedestal lift orientation while preserving the essential vacuum function.
2Adaptability or versatility
If foreline geometry dictates pedestal lift orientation, then vacuum evacuation is achieved, but adding new hardware and performing maintenance becomes difficult
Solution Approach 1:
By relocating the foreline assembly to the upper chamber, the spatial constraint between foreline geometry and pedestal lift orientation is eliminated. This dimensional change decouples the orientation requirements, allowing pedestal lifts to be oriented optimally for maintenance and hardware addition without being constrained by lower chamber foreline positioning.
Solution Approach 2:
The invention allows for asymmetric optimization of pedestal lift orientations since the foreline is no longer constraining them from below. Each pedestal can be independently oriented according to its specific maintenance and operational requirements, rather than being forced into a symmetric configuration dictated by foreline geometry.
3Volume of moving object
If lower chamber hardware is crowded, then compact design is achieved, but servicing and adding hardware becomes very difficult
Solution Approach 1:
The foreline assembly is extracted from the lower chamber volume, removing it from the crowded hardware space. This extraction maintains the compact overall design while creating sufficient clearance in the lower chamber for easy servicing and addition of hardware components.
Solution Approach 2:
The foreline assembly is relocated to the upper chamber dimension, effectively moving the vacuum evacuation function to a different spatial zone. This dimensional separation preserves compact lower chamber volume for processing components while providing adequate space for maintenance activities.
Data Source
AI summary
A foreline assembly for a quad station process module (QSM) is provided. In some examples, a foreline assembly comprises four inlets each connectable to a chamber port of a process module of the QSM and an outlet connectable directly or indirectly to a vacuum source. A first foreline bifurcation is disposed proximate the outlet of the foreline assembly. Two second bifurcations are each disposed between the first foreline bifurcation and a respective pair of the inlets. The first and second bifurcations divide the foreline assembly into three sections. A respective diameter of a foreline in each section increases stepwise at a respective bifurcation in a direction of gas flow from at least one of the inlets to the outlet of the foreline assembly and is constant within a respective section of the foreline assembly.