Angular Velocity Sensor Cap Resonance Tuning Across Temperature
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Solution Overview
Problem
Existing electronic devices with angular velocity sensors experience fluctuations in output due to resonance between the cap and vibrator elements at varying temperatures, leading to degraded temperature drift characteristics and unstable sensor readings.
Innovation Solution
The electronic device is designed with a substrate hosting three angular velocity sensors with distinct vibrator elements vibrating along orthogonal planes, and a cap that is engineered to have resonance modes outside the vibration frequency bands of these sensors within the operational temperature range, preventing unnecessary vibrations and maintaining stable sensor outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap covers the angular velocity sensors, then the sensors are protected and structurally integrated, but resonance occurs between the cap and vibrator elements at certain temperatures causing output fluctuations
Solution Approach 1:
The patent adjusts the thickness of the cap to change its resonance frequency characteristics. By modifying this physical parameter, the cap's resonance modes are shifted to frequencies that do not overlap with the vibrator elements' operating frequencies across the temperature range, thereby eliminating harmful resonance while maintaining the protective function of the cap.
Solution Approach 2:
The patent accounts for temperature-dependent changes in resonance frequencies. The cap is designed with dynamic characteristics that adapt to temperature variations, ensuring that its resonance modes remain outside the vibration frequency bands of the sensors throughout the operational temperature range, thus preventing resonance-induced instability.
2Measurement precision
If the cap resonance frequency is close to vibrator element frequency at certain temperatures, then resonance occurs causing unnecessary vibration, but changing cap design may affect other performance characteristics
Solution Approach 1:
The patent modifies the cap thickness parameter to achieve the desired resonance frequency separation. This single parameter change effectively prevents resonance without requiring complex multi-component structures, thus improving measurement precision while avoiding excessive device complexity.
3Adaptability or versatility
If temperature varies during operation, then the resonance frequency of the cap changes, but this causes the cap to resonate with vibrator elements at certain temperatures
Solution Approach 1:
The patent designs the cap with dynamic resonance characteristics that are evaluated across the full operational temperature range. The cap thickness is optimized so that even as its resonance frequency shifts with temperature, it remains outside the vibration frequency bands of the sensors, ensuring reliable operation from -40°C to +105°C without output fluctuations.
Solution Approach 2:
The patent performs preliminary design optimization to ensure the cap's resonance modes are positioned outside the sensor frequency bands across the entire expected temperature range before actual operation. This preemptive design approach prevents resonance issues from occurring during temperature variations in normal use.
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 effectively suppresses resonance between the cap and vibrator elements, stabilizing zero-point outputs and enhancing angular velocity detection accuracy by ensuring the cap's resonance modes are outside the sensor's vibration frequency bands, thereby improving temperature drift characteristics and detection precision.
Implementation Method 1
the resonance frequency of the cap changes with temperature. Accordingly, when the resonance frequency of the cap is close to the vibration frequency of the vibrator element at a particular temperature, the cap and the vibrator element resonate and an unnecessary vibration is generated
Data Source
AI summary
An electronic device includes a substrate, a first electronic component mounted on the substrate and including a first vibrator element vibrating along a first plane along the substrate, a second electronic component mounted on the substrate and including a second vibrator element vibrating along a second plane crossing the first plane, a third electronic component mounted on the substrate and including a third vibrator element vibrating along a third plane crossing the first plane and the second plane, and a cap mounted on the substrate and covering the first electronic component, the second electronic component, and the third electronic component, wherein a resonance mode of the cap is not within vibration frequency bands of the second vibrator element and the third vibrator element in an operation temperature range.