Dual Scanning Stage for Profilometer Throughput
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Solution Overview
Problem
Conventional stylus profilometers face significant throughput limitations due to the time-consuming processes of loading, unloading, and aligning substrates, which can account for up to 40% of the total substrate processing time.
Innovation Solution
A dual-stage system with independent X-axis and Z-axis movement, where two substrates are handled simultaneously using a guide beam for Y-axis movement, and a robot for loading and unloading, allowing continuous scanning without waiting for substrate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single substrate is processed at a time in a conventional profilometer, then the device complexity is low, but the productivity is limited due to sequential loading, unloading, and scanning operations
Solution Approach 1:
The system is divided into multiple independent stages (first stage and second stage), each capable of holding and scanning a substrate independently. This segmentation allows parallel processing of multiple substrates, thereby increasing throughput without requiring complete redesign of the entire system architecture
Solution Approach 2:
Multiple stages are merged onto a single guide beam structure, sharing common Y-axis and Z-axis movement infrastructure. This combining approach enables parallel substrate processing while avoiding the need for completely separate systems, thus improving productivity without proportionally increasing device complexity
2Loss of time
If the stage is moved for substrate positioning and scanning, then the ease of operation is maintained, but the loss of time increases due to sequential loading, unloading, and aligning operations
Solution Approach 1:
While one substrate is being scanned, the robot performs preliminary actions of loading and positioning the next substrate on the second stage. This preliminary action eliminates idle time between scanning operations, as the next substrate is already prepared and positioned before the current scan completes
Solution Approach 2:
The system maintains continuous useful action by overlapping the scanning operation of the first substrate with the loading and positioning operations of the second substrate. The guide beam moves continuously in the Y-axis while individual stages move independently in the X-axis, ensuring no idle time in the overall process
3Adaptability or versatility
If independent X-axis movement is provided for each stage, then the adaptability is improved for handling multiple substrates, but the device complexity increases due to multiple motors and control systems
Solution Approach 1:
The guide beam structure serves multiple functions: it provides the Y-axis movement for both stages, acts as a common support structure, and enables coordinated movement of multiple stages. This multi-functionality reduces the need for separate control systems for each stage, thereby increasing adaptability without proportionally increasing complexity
Data Source
AI summary
A system having a beam for providing movement of a first stage and a second stage in a Y axis. The first stage receives a first substrate. A first motor provides movement for the first stage in an X axis. The second stage receives a second substrate. A second motor provides movement for the second stage in the X axis. The first stage and the second stage move together in the Y axis and independently in the X axis. A robot loads substrates onto the first stage and the second stage. A controller directs the robot to load a second substrate onto the second stage while simultaneously directing the first stage and the guide beam to scan a first substrate.