Inspection System Vertical Stacking Reduces Footprint
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Solution Overview
Problem
Existing inspection systems for semiconductor wafers have a large footprint due to the arrangement of inspection units in both vertical and horizontal directions, which limits efficiency and space utilization.
Innovation Solution
The inspection system is designed with inspection units arranged in rows within a housing that includes a loader section at one end, featuring transfer paths and mechanisms to efficiently move wafers between storage containers and inspection units, reducing the footprint by optimizing the layout and integrating transfer mechanisms and cameras within the existing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inspection units are arranged in both vertical and horizontal directions to increase inspection capacity, then productivity is improved, but the footprint area increases
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of inspection units to a three-dimensional configuration by stacking inspection units vertically across multiple tiers. The loader section is positioned at one end of the inspection part, allowing transfer mechanisms to service multiple tiers without requiring proportional horizontal space expansion. This vertical stacking approach increases inspection capacity while minimizing footprint area growth.
2Device complexity
If a common transfer robot is provided for all cells to transfer wafers, then device complexity is reduced, but the area required for transfer paths increases
Solution Approach 1:
The patent divides the transfer function into segment-specific transfer mechanisms, where each transfer mechanism is dedicated to serving inspection units within its own tier. This segmentation allows each transfer mechanism to operate independently with shorter transfer paths, reducing the total area required for transfer operations while maintaining manageable device complexity through modular design.
3Area of stationary object
If inspection units are densely arranged to reduce footprint, then area is reduced, but alignment and temperature measurement become more difficult
Solution Approach 1:
The patent introduces transfer mechanisms as intermediary components between the loader section and inspection units. These transfer mechanisms include alignment cameras and positioning systems that facilitate precise wafer alignment and temperature measurement even in densely packed configurations. The intermediary transfer mechanisms bridge the space constraints, enabling accurate detection and measurement functions to be maintained despite reduced footprint area.
Data Source
AI summary
An inspection system includes: an inspection section provided with an inspection part having a plurality of inspection units each including a tester that performs an electrical inspection of an inspection target, and a probe card provided between the tester and the inspection target; and a loader section including an arrangement part in which a storage container for the inspection target is disposed, and a loader that delivers the inspection target between the storage container and the inspection section. The inspection part includes a plurality of inspection unit rows that are formed by arranging the plurality of inspection units in one horizontal direction and arranged in a plurality of tiers in a vertical direction. The arrangement part is provided on an end part side in one direction of the inspection part.