Rotating Shutter Platen for Multi-Substrate Vacuum Coating
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Solution Overview
Problem
Vacuum coating systems require numerous coating runs to evaluate process parameters, which are laborious and time-consuming, hindering efficient process development due to cyclic pressure changes, particularly in large-format systems, where each coating run may span a full day or more to complete.
Innovation Solution
A shutter apparatus for use in a vacuum coating system, which includes a platen with a plurality of substrate locations, where each coating run is dedicated to testing a single process parameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple coating runs are conducted to evaluate process parameters, then comprehensive process evaluation is achieved, but the time required increases significantly
Solution Approach 1:
The platen is divided into multiple substrate locations (e.g., six positions) that can be independently selected and processed. This segmentation allows different substrates to be coated simultaneously in different vacuum cycles, reducing the total time needed to evaluate multiple process parameters while maintaining comprehensive evaluation coverage.
Solution Approach 2:
The shutter apparatus enables dynamic selection of which substrate location is exposed during each vacuum cycle. By rotating or positioning the shutter to expose different substrate locations, the system can efficiently cycle through multiple process parameters without requiring separate dedicated runs for each parameter, thereby reducing overall testing time.
2Productivity
If a shutter apparatus is introduced to enable independent processing of multiple substrates, then productivity increases, but device complexity increases
Solution Approach 1:
The shutter apparatus is designed to serve multiple functions: it acts as a selective barrier, a positioning mechanism, and a vacuum seal. By making the shutter multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while still achieving the productivity benefits of independent substrate processing.
Solution Approach 2:
The shutter serves as an intermediary component between the vacuum chamber and the substrate locations. It mediates the vacuum environment by selectively allowing access to specific substrates during coating operations, enabling independent processing without requiring complete system redesign or multiple separate vacuum chambers.
3Productivity
If the substrate-location aperture is sized to expose only one substrate location at a time, then independent processing is enabled, but the aperture size is constrained
Solution Approach 1:
Rather than using a large static aperture, the system employs a smaller aperture combined with dynamic positioning of the shutter and platen. The aperture size is optimized for single-substrate exposure, and the system achieves multi-substrate capability through temporal and spatial dynamics during vacuum cycles, maintaining productivity while constraining aperture dimensions.
Data Source
AI summary
A shutter apparatus for use in a part-manufacturing process is disclosed. The shutter apparatus includes a platen having a plurality of substrate locations. The shutter apparatus also includes a shutter defining a substrate-location aperture. The shutter covers the platen except for a selectable one of the plurality of substrate locations of the platen exposed through the substrate-location aperture. The substrate-location aperture is sized to expose only one of the plurality of substrate locations at a time, such that the shutter covers all but a selected one of the plurality of substrate locations. The shutter and the platen are selectively rotatable, relative to each other, to alternatingly expose a different selected one of the plurality of substrate locations.