Wafer Simulator Alignment Verification in Vacuum
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Solution Overview
Problem
The setup and calibration of silicon wafer handling devices in vacuum environments are challenging due to limited visibility and access, leading to subjective and inconsistent alignment, and existing bench fixtures do not account for part-specific tolerances or manufacturing variances, necessitating a means to verify alignment without venting the treatment chamber.
Innovation Solution
A workpiece simulator with sensors and circuitry for monitoring alignment, providing visual or wireless indicators to ensure proper transport and support setup within evacuated chambers, using pressure sensors to detect force and alignment during movement and positioning, allowing for calibration without exposing the chamber to atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If setup is performed in vacuum environment, then alignment verification is possible during actual operation, but visibility and access for physical measurements are limited
Solution Approach 1:
The patent replaces mechanical/optical measurement systems with electronic sensing systems. Pressure sensors, capacitive sensors, and other electronic detectors are used instead of visual inspection or physical measurement tools, enabling alignment verification in vacuum environments where traditional mechanical measurement methods are ineffective.
Solution Approach 2:
The patent introduces intermediary sensing elements (pressure sensors, capacitive sensors, test fixtures with sensors) that mediate between the workpiece and the measurement system. These sensors act as intermediaries that can operate in vacuum and transmit alignment information electronically to operators outside the vacuum chamber.
2Difficulty of detecting and measuring
If setup is performed at atmospheric pressure, then visibility and access for measurements are improved, but vacuum application causes equipment misalignment
Solution Approach 1:
The patent implements preliminary alignment verification using sensors before vacuum application. The sensor-based measurement system allows alignment to be checked and adjusted while the chamber is still at atmospheric pressure, ensuring proper alignment before the vacuum causes wall movement and potential misalignment.
Solution Approach 2:
The patent employs feedback mechanisms where sensors continuously monitor alignment parameters, and this information is fed back to operators or control systems. This allows real-time adjustment and verification of alignment, compensating for any shifts that occur during vacuum application or chamber operation.
3Ease of manufacture
If generic bench fixtures are used, then setup process is simplified, but part-specific tolerances and manufacturing variances are not compensated
Solution Approach 1:
The patent applies local quality by using sensors at specific critical locations on the workpiece and fixture interfaces. Rather than requiring complex custom fixtures for each part, sensors are placed at key measurement points to detect local alignment variations, allowing generic fixtures to work with different parts while maintaining precision through localized sensing.
Solution Approach 2:
The patent changes the measurement parameters from physical dimensions to electrical signals. Sensors convert mechanical alignment parameters into electrical signals that can be processed and analyzed, allowing for precise measurement and compensation of alignment variations without requiring complex mechanical fixture adjustments.
4Manufacturing precision
If periodic inspection requires venting the chamber, then alignment verification can be performed, but downtime increases and contamination risks arise
Solution Approach 1:
The patent enables continuous alignment monitoring during vacuum operation through sensor-based systems. The sensors remain operational in the vacuum environment, allowing alignment verification to occur continuously or at any time during chamber operation, eliminating the need to stop production and vent the chamber for inspection.
Solution Approach 2:
The patent uses sensor intermediaries that can operate within the vacuum chamber to provide alignment information without requiring chamber venting. These sensors act as communication intermediaries, transmitting alignment data through the vacuum barrier to operators outside, enabling inspection without breaking the vacuum seal.
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
Enables precise and consistent alignment verification of wafer handling equipment within vacuum environments, reducing downtime and minimizing contamination risks, while accommodating part-specific tolerances and manufacturing variances without venting the chamber.
Implementation Method 1
the sensors are used to sense force or pressure exerted against the workpiece simulator
Implementation Method 2
the sensors could be used to measure distance, displacement, capacitance or frequency
Data Source
AI summary
Method and apparatus for use in setting up workpiece treatment or processing equipment. A disclosed system processes silicon wafers that are treated during processing steps in producing semiconductor integrated circuits. The processing equipment includes a wafer support that supports a wafer in a treatment region during wafer processing. A housing provides a controlled environment within the housing interior for processing the wafer on the wafer support. A mechanical transfer system transports wafers to and from the support. A wafer simulator is used to simulate wafer movement and includes a pressure sensor for monitoring contact between the simulator and the wafer transfer and support equipment. In one illustrated embodiment the wafer simulator is generally circular and includes three equally spaced pressure sensors for monitoring contact with wafer transport and support equipment.