Laser Calibration Pod for Wafer Load Port Alignment
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Solution Overview
Problem
Current wafer handling systems in semiconductor fabrication facilities face challenges in accurately calibrating the lateral alignment of robotic wafer handling systems with load ports, which is prone to human error and requires tedious manual processes, especially when dealing with multiple load ports in an overhead hoist transport system.
Innovation Solution
A calibration pod with lasers mounted on its bottom is used to align with the load port's alignment pins, allowing for automated alignment by projecting laser beams onto the load port, reducing human intervention and improving accuracy across multiple load ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration processes are used for robotic wafer handling systems, then flexibility in operation is maintained, but measurement precision and reliability of alignment calibration deteriorate due to human error
Solution Approach 1:
The patent introduces alignment pins as intermediary physical references and laser beams as intermediary visual indicators. The alignment pins provide fixed, precise reference points in the load port, while lasers mounted on the calibration pod project visible beams that indicate alignment status. This intermediary system eliminates direct human measurement and judgment, replacing it with objective physical and optical references that ensure high measurement precision while enabling automated calibration processes.
2Productivity
If multiple load ports are calibrated individually through manual processes, then each port can be adjusted separately, but productivity and time efficiency worsen due to repetitive tedious calibration for each port
Solution Approach 1:
The calibration pod is designed as a universal calibration device that can be used with multiple different load ports. The pod contains multiple lasers that can be selectively activated, and the same physical calibration pod serves as the calibration instrument for all load ports in the system. This multi-functional design eliminates the need for different calibration tools for each port and enables efficient calibration of multiple ports in sequence, significantly improving productivity while reducing total calibration time compared to individual manual calibration of each port.
3Measurement precision
If visual alignment methods without laser indicators are used, then device complexity is reduced, but measurement precision and ease of operation deteriorate due to difficulty in observing alignment between pod features and load port features
Solution Approach 1:
The patent employs laser beams as optical indicators that provide clear, high-contrast visual signals for alignment observation. The laser beams create bright, easily distinguishable markers that indicate when the calibration pod is properly aligned with the load port. This optical signaling method dramatically improves measurement precision and ease of observation compared to traditional visual methods relying on direct observation of mechanical features. The added complexity of lasers is minimal and justified by the significant improvement in alignment observation accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The calibration pod enhances the precision and efficiency of lateral alignment calibration, minimizing human error and enabling fast calibration of multiple load ports with a single calibration pod, thus improving the overall throughput and reliability of wafer handling processes.
Implementation Method 1
at least one laser disposed on a bottom of the pod body
Data Source
AI summary
A calibration pod for calibrating a robotic wafer pod handling apparatus includes a pod body configured for handling by the robotic pod handling apparatus, at least one laser disposed on a bottom of the pod body, and a power module disposed on or in the pod body and operatively connected to power the at least one laser. In a manufacturing method, the pod body comprises a wafer carrier for carrying a cassette of semiconductor wafers, which has a bottom with a plurality of holes for aligning placement of the wafer carrier in a load port of a semiconductor device fabrication facility. The at least one laser here includes a plurality of lasers corresponding to the plurality of holes in the bottom of the wafer carrier, and each laser is mounted in a respective hole of the bottom of the wafer carrier.