Infrared Peripheral Verification Tool for Wafer Cassette Alignment
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Solution Overview
Problem
Current semiconductor manufacturing processes face challenges in ensuring precise alignment of peripherals like wafer cassettes, leading to process delays, wafer damage, and decreased yield due to incorrect assumptions about dimensional alignment.
Innovation Solution
An automated method and apparatus using light emitters and receivers, specifically infrared light, to verify the dimensions of semiconductor manufacturing peripherals, ensuring accurate alignment by comparing measured dimensions to pre-selected standards, and allowing for mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual or mechanical alignment of cassette top/bottom with transfer blade is used, then alignment process is simple, but alignment precision deteriorates due to incorrect assumptions about dimensional alignment
Solution Approach 1:
The patent replaces visual/mechanical alignment methods with an optical measurement system using light emitters and receivers to verify cassette dimensions. The system uses light beams to measure the physical characteristics of the cassette and automatically determines alignment accuracy, eliminating the need for manual visual alignment while providing precise dimensional verification.
Solution Approach 2:
The patent creates an optical copy or representation of the cassette dimensions by measuring its physical characteristics with light and comparing them against stored reference data. This allows the system to verify alignment without direct mechanical contact or visual inspection, using instead an informational copy of the dimensional data for automated verification.
2Productivity
If dimensional verification of peripherals is not performed, then manufacturing cycle time is reduced, but wafer damage and process delays increase due to misalignment
Solution Approach 1:
The patent performs dimensional verification of the cassette as a preliminary action before the wafer transfer process begins. By measuring and verifying cassette dimensions in advance using the optical system, the system ensures alignment accuracy is confirmed before processing starts, preventing misalignment-related delays and damage during the actual manufacturing process.
Solution Approach 2:
The system enables the manufacturing process to self-verify alignment by automatically measuring cassette dimensions and comparing them against reference standards. This self-service verification eliminates the need for manual inspection while ensuring reliability, allowing the process to quickly confirm proper alignment and proceed without delays.
3Manufacturing precision
If automated light-based dimensional verification is implemented, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential dimensional verification function from a complex alignment system. By using simple light emitters and receivers to measure specific critical dimensions of the cassette and comparing them against reference data, the system achieves high alignment precision without implementing a complex mechanical alignment apparatus. The solution focuses on measuring only the necessary dimensional parameters rather than controlling all mechanical aspects.
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
This approach reduces cycle time, increases yield, and minimizes wafer damage by ensuring precise alignment during processing, thereby reducing manufacturing costs and improving accuracy.
Implementation Method 1
emitting a selected spectrum of light from the emitter housing
Implementation Method 2
measuring the selected spectrum of light received at the receiver housing
Data Source
AI summary
Apparatus and methods for verification of the dimensions of a semiconductor manufacturing peripheral are disclosed, in which the peripheral, e.g., a wafer cassette, is positioned between, and is enveloped by, an emitter housing and an opposing receiver housing adapted for emitting and receiving, respectively, light from a selected portion of the electromagnetic spectrum, preferably infrared. The measured light is used to verify the dimensions of the target peripheral in comparison with a pre-selected standard.