Sensor Mounting Pedestal Thermal Warpage Compensation
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Solution Overview
Problem
Temperature-induced warpage of circuit boards due to mismatched coefficients of thermal expansion between sensor packages and circuit boards can cause inaccuracies in pre-calibrated sensors when installed in electronic devices, as the warpage behavior changes upon mounting.
Innovation Solution
A mounting pedestal with similar size, shape, and thermal expansion characteristics to the sensor package is coupled to the circuit board opposite the sensor, isolating the board from the device's surface and maintaining consistent warpage behavior, thus preserving the accuracy of thermal calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the circuit board is directly mounted to the device surface, then the assembly is simplified, but temperature-induced warpage occurs due to CTE mismatch causing sensor calibration inaccuracies
Solution Approach 1:
A mounting pedestal is introduced as an intermediary component between the circuit board and the device surface. The pedestal is configured with thermal expansion characteristics that match the circuit board, serving as a mediator that prevents warpage while maintaining a relatively simple assembly process. The pedestal acts as a buffer that decouples the CTE mismatch between the circuit board and the device surface.
Solution Approach 2:
The mounting structure is segmented into distinct components: the circuit board, the mounting pedestal, and the device surface. This segmentation allows each component to be optimized independently - the pedestal can be specifically designed with matching CTE properties to prevent warpage, while the overall assembly remains manageable.
2Measurement precision
If a mounting pedestal is added to prevent warpage, then sensor calibration accuracy is maintained, but device complexity increases
Solution Approach 1:
The mounting pedestal serves as a specialized intermediary that, while adding a component, provides a standardized interface between the circuit board and device surface. This standardization can actually reduce overall complexity by providing a repeatable, modular mounting solution that maintains precision without requiring complex adjustment mechanisms.
3Reliability
If the circuit board is isolated from the device surface using a mounting pedestal, then consistent warpage behavior is maintained preserving calibration, but the mounting process becomes more complex
Solution Approach 1:
The mounting pedestal is pre-configured with thermal expansion characteristics matched to the circuit board before assembly. This preliminary preparation ensures that when the assembly is manufactured and deployed, the calibration consistency is automatically maintained without requiring complex real-time adjustments or specialized manufacturing processes.
Solution Approach 2:
The pedestal as an intermediary component provides a standardized interface that simplifies the mounting process while maintaining reliability. By decoupling the circuit board from direct contact with the device surface, it creates a predictable thermal expansion behavior that preserves calibration consistency across different installation environments.
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 configuration ensures that the sensor system maintains its calibrated performance by minimizing the impact of temperature-induced warpage, ensuring consistent output and accuracy across different installation environments.
Implementation Method 1
Temperature-induced warpage of circuit boards due to mismatched coefficients of thermal expansion between sensor packages and circuit boards
Data Source
AI summary
Examples related to the incorporation of a sensor into an electronic device are disclosed. One example provides a system including a circuit board comprising a first side and a second side opposite the first side, a sensor housed in a package bonded to the first side of the circuit board, and a mounting pedestal coupled to the circuit board on the second side at a location opposite the package, the mounting pedestal configured to be mounted to a surface in an electronic device.