Parallel Photoresist Processing Lines with Buffer Transfer
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Solution Overview
Problem
The existing photo apparatus layout is inefficient due to the integration of the coating line and exposure unit with the development line, leading to increased processing time and reduced operation rates, as issues in one unit can halt the entire process.
Innovation Solution
A photo apparatus with parallel photo-process lines, including a loading/unloading unit, coating line, exposure line, and development line, where a transferring line temporarily stores substrates and transfers them between these lines based on processing states, allowing for separate operation and minimizing the overall layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the coating line and exposure unit are integrated with the development line in a single photo process line, then the layout is compact, but the processing time increases and operation rate decreases due to sequential processing and vulnerability to line-wide stoppages
Solution Approach 1:
The patent divides the photo process line into separate functional modules: coating line, exposure line, and development line. Each line operates independently with its own substrate processing capability, allowing parallel operations and preventing cascading failures across the entire system.
Solution Approach 2:
The patent introduces a transferring line as an intermediary system that connects the separate coating, exposure, and development lines. This transferring line acts as a buffer and coordination mechanism, enabling smooth substrate transfer between independent lines while maintaining overall process integration.
2Productivity
If the coating line, exposure unit, and development line operate in parallel with separate substrate storage, then the operation rate increases and processing time decreases, but the layout area increases
Solution Approach 1:
The patent utilizes vertical space and three-dimensional arrangement for substrate storage in the transferring line, stacking substrates vertically rather than requiring extensive horizontal space. This allows parallel line operations with increased productivity while minimizing the footprint of the overall layout.
3Reliability
If issues occur in one unit of the integrated photo process line, then the entire process halts, but separating the lines requires additional transferring mechanisms and substrate storage
Solution Approach 1:
By segmenting the photo process into independent coating, exposure, and development lines, the patent ensures that failures in one line do not propagate to other lines. Each line has its own substrate loading and processing capability, providing fault isolation and improved process continuity.
Solution Approach 2:
The transferring line serves as an intermediary buffer system that manages substrate flow between independent lines. It provides temporary storage and coordination, allowing lines to operate independently while maintaining overall process integration, thus balancing reliability improvement with controlled system complexity.
Data Source
AI summary
A photo process apparatus including: a loading/unloading unit that loads and unloads a substrate; a coating line that coats photoresist on the substrate; an exposure line that exposes the photoresist coated on the substrate; a development line that develops the exposed substrate; and a transferring line that temporarily stores the substrate coated with the photoresist and loads the substrate coated with the photoresist to the exposure line and temporarily stores the exposed substrate and loads the exposed substrate to the development line.