Wireless Substrate Sensor for Semiconductor Vibration Monitoring
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Solution Overview
Problem
Semiconductor processing systems face challenges in precise positioning and alignment due to the limitations of bulky and costly high-accuracy accelerometers, which are necessary for optimal robotic handling and transport of substrates, leading to potential defects and yield loss.
Innovation Solution
A wireless substrate-like sensor with a 3-axis MEMS accelerometer configuration, integrated with a power source, wireless communication module, and controller, designed to mimic the form factor of a standard substrate, allowing for real-time or near-real-time transmission of acceleration data to optimize robotic handling and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-accuracy accelerometers are used for precise positioning and alignment, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces traditional mechanical/electrolytic accelerometer systems with a capacitive sensing system that uses electrical fields to detect position and alignment. The capacitive sensor measures changes in capacitance caused by displacement, eliminating the need for complex mechanical moving parts while achieving high measurement precision.
Solution Approach 2:
The patent changes the measurement parameter from mechanical acceleration detection to electrical capacitance measurement. By monitoring capacitance changes between conductive elements, the system achieves precise positioning and alignment measurements without requiring complex mechanical accelerometer assemblies.
2Measurement precision
If traditional accelerometers are used for vibration detection, then measurement accuracy is improved, but the sensor size increases
Solution Approach 1:
The patent replaces mechanical accelerometer components with a capacitive sensing arrangement that detects vibration through changes in electrical capacitance. This substitution eliminates bulky mechanical parts while maintaining vibration detection accuracy through electrical field sensing between conductive elements.
3Manufacturing precision
If high-precision sensors are implemented for substrate positioning, then manufacturing precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive mechanical precision sensors with a capacitive sensing system that uses electrical fields for measurement. This approach achieves high substrate positioning accuracy while reducing system cost by eliminating complex mechanical components and associated calibration requirements.
Solution Approach 2:
The capacitive sensing system serves multiple functions including position detection, alignment measurement, and vibration monitoring, replacing multiple specialized sensors with a single multi-functional system that reduces overall cost while maintaining manufacturing precision.
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 wireless sensor effectively reduces defects caused by transportation vibrations by providing accurate acceleration data, facilitating improved alignment and calibration of semiconductor processing systems while maintaining a cost-effective and compact form factor.
Implementation Method 1
an acceleration detection component operably coupled to the controller to provide information relative to acceleration of the sensor in three axes
Data Source
AI summary
A wireless sensor is provided to obtain information relating to vibration of wafers or substrates in a semiconductor processing system. In one exemplary embodiment, a wireless substrate-like sensor is provided and includes a power source adapted to provide power to the sensor, a wireless communication module coupled to the power source, and a controller coupled to the power source and the wireless communication module. An acceleration detection component is operably coupled to the controller to provide information relative to acceleration of the sensor in three axes.