Vertical Batch Furnace Carousel Layout for High-Density Wafer Cassette Storage
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Solution Overview
Problem
Vertical batch furnace assemblies face limitations in storing capacity and efficient wafer cassette handling, which hampers the processing efficiency of wafers.
Innovation Solution
A vertical batch furnace assembly with a cassette storage carousel of 1.1 to 1.6 meters in diameter, equipped with a cassette handler and wafer handler, and an internal wall for wafer transfer, allowing for increased storage and efficient transfer of wafer cassettes and boats, optimizing the use of available space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional cassette storage system is used, then the structure is simple, but the storing capacity is limited
Solution Approach 1:
The patent transitions from a conventional linear or two-dimensional storage arrangement to a three-dimensional carousel structure with multiple tiers and radial positioning. The carousel rotates to bring different storage positions to the access point, effectively utilizing vertical and radial dimensions to maximize storage capacity within a compact footprint.
Solution Approach 2:
The design implements nested storage by placing multiple cassette positions on different tiers of the carousel, with inner and outer radial positions on each tier. This nested arrangement allows the system to store a large number of cassettes by efficiently packing storage positions in a concentric, multi-level configuration.
2Quantity of substance
If more cassettes are stored in the cassette storage, then the storing capacity increases, but the space utilization becomes inefficient with unused gaps
Solution Approach 1:
By utilizing the vertical dimension with multiple tiers and the radial dimension with inner and outer positions on each tier, the carousel achieves dense packing of cassettes. The rotational mechanism allows all positions to be accessed sequentially, eliminating the need for excessive horizontal spacing that would create unused gaps in linear storage systems.
Solution Approach 2:
The rotating carousel dynamically repositions storage locations to bring cassettes to the access point as needed. This dynamic operation allows the system to maintain high storage density while providing efficient access, as the rotation mechanism enables any cassette to be brought to the loading/unloading position without requiring additional clearance space.
3Quantity of substance
If the cassette storage carousel diameter is increased to accommodate more cassettes, then the storing capacity increases, but the footprint area increases
Solution Approach 1:
The patent resolves this contradiction by moving from a single large-diameter carousel to a multi-tiered carousel structure. The vertical stacking of tiers allows the system to accommodate more cassettes by utilizing vertical space rather than increasing the horizontal diameter, thereby maintaining a compact footprint while achieving high storage capacity.
Solution Approach 2:
The nested concentric tiers of the carousel allow efficient use of the radial space within the footprint. By arranging storage positions in inner and outer rings on each tier, the system maximizes the utilization of the available circular footprint area, accommodating more cassettes without proportionally increasing the overall diameter.
Data Source
AI summary
A vertical batch furnace assembly for processing wafers comprising a cassette handling space, a wafer handling space, and an internal wall separating the cassette handling space and the wafer handling space. The cassette handling space is provided with a cassette storage configured to store a plurality of wafer cassettes. The cassette handling space is also provided with a cassette handler configured to transfer wafer cassettes between the cassette storage and a wafer transfer position. The wafer handling space is provided with a wafer handler configured to transfer wafers between a wafer cassette in the wafer transfer position and a wafer boat. The internal wall is provided with a wafer transfer opening adjacent the wafer transfer position for a wafer cassette from or to which wafers are to be transferred. The cassette storage comprises a cassette storage carousel with a diameter between 1.1 and 1.6 meter.