Differential Crystal Resonator Layout for Low g-Sensitivity
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Solution Overview
Problem
Conventional crystal resonators experience undesired frequency shifts due to external accelerations, leading to increased g-sensitivity, which affects their performance.
Innovation Solution
The crystal resonator design incorporates a crystal plate with first and second vibration sections, each paired with electrodes of opposite polarity, causing them to oscillate out of phase and counteract external forces, reducing g-sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional crystal resonator is used, then it can provide oscillation signals, but it experiences frequency shifts due to external accelerations resulting in high g-sensitivity
Solution Approach 1:
The crystal plate is divided into a first vibration section and a second vibration section, each with separate electrodes. This segmentation allows independent control of vibration modes in each section, enabling the system to operate in a differential mode that cancels out acceleration-induced frequency shifts while maintaining stable oscillation signals.
Solution Approach 2:
The patent applies preliminary anti-action by configuring the electrodes to generate opposite polarity voltages on the first and second vibration sections before external acceleration occurs. This creates pre-compensating forces that counteract the expected acceleration effects, thereby reducing g-sensitivity and maintaining frequency stability under external forces.
2Object-affected harmful factors
If the crystal plate is divided into vibration sections with opposite polarity electrodes, then g-sensitivity is reduced, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple electrodes into a unified electrode arrangement where first and second electrodes are positioned on opposite sides of the crystal plate. This merging approach simplifies the overall structure by using a symmetric configuration that achieves differential vibration control without requiring complex multi-electrode assemblies.
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 design significantly reduces g-sensitivity, maintaining stable oscillation frequencies despite external accelerations, enhancing the resonator's performance.
Implementation Method 1
an electrode set 3 that includes a first electrode pair 31 that is disposed on the first vibration section 21, and a second electrode pair 32 that is disposed on the second vibration section 22... causing the first vibration section 21 and the second vibration section 22 to separately move toward each other and move away from each other
Data Source
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AI summary
A crystal resonator (100) includes a crystal plate (2) and an electrode set (3). The crystal plate (2) includes a first vibration section (21) and a second vibration section (22) arranged along an oscillating direction (X), and exhibits a thickness shear mode. The electrode set (3) includes a first electrode pair (31) disposed on the first vibration section (21), and a second electrode pair (32) disposed on the second vibration section (22). The first electrode pair (31) and the second electrode pair (32) apply the applied voltages with opposite electrical polarities to the first vibration section (21) and the second vibration section (22), respectively, which causes the first vibration section (21) and the second vibration section (22) to dynamically deform in the thickness shear mode along the oscillating direction (X), and do out of phase motion with respect to each other.