Quartz Resonator Structure With Internal Thermistor Sensing
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Solution Overview
Problem
Modern quartz resonators face challenges in precise temperature measurement due to the thermistor being disposed outside the casing, leading to an excessively large volume and inconsistent frequency changes due to differing expansion coefficients between the packaging casing and oscillator crystal materials.
Innovation Solution
The quartz resonator design incorporates a thermistor within the casing, closer to the oscillator crystal, allowing precise temperature measurement and using quartz for both the casing and oscillator crystal to ensure consistent expansion coefficients, thereby reducing volume and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the thermistor is disposed outside the casing, then the structure is simpler, but the temperature measurement precision deteriorates and the volume increases
Solution Approach 1:
The thermistor is nested inside the casing, specifically positioned in the sealed space between the oscillator crystal and the casing wall. This nesting approach allows the thermistor to be integrated within the existing casing structure without adding external components, thereby improving temperature measurement precision while avoiding significant increases in overall device volume or structural complexity.
2Ease of manufacture
If the thermistor is disposed outside the casing, then the manufacturing process is simpler, but the temperature measurement precision deteriorates
Solution Approach 1:
The casing is segmented into a first casing and a second casing, creating a dedicated sealed space for the thermistor. This segmentation allows the thermistor to be positioned precisely near the oscillator crystal for accurate temperature measurement, while the sealing structure protects the thermistor and maintains manufacturing simplicity through modular assembly.
3Adaptability or versatility
If the casing material and oscillator crystal material have different expansion coefficients, then the manufacturing flexibility is improved, but the frequency stability deteriorates
Solution Approach 1:
The sealed space is designed with specific local characteristics - it is configured to remain substantially unchanged during temperature changes. This local quality control ensures that even though the casing and oscillator crystal may have different expansion coefficients, the critical measurement environment near the crystal remains stable, maintaining frequency stability while allowing manufacturing flexibility.
Solution Approach 2:
The sealed space acts as a cushioning environment that compensates for differential thermal expansion between the casing and oscillator crystal materials. By pre-configuring this stable thermal environment, the design anticipates and mitigates the adverse effects of material expansion differences, ensuring frequency stability across temperature variations.
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 solution enables precise temperature measurement and reduces the resonator's volume while ensuring consistent frequency changes during temperature regulation, enhancing the overall accuracy of the quartz resonator.
Implementation Method 1
The thermistor is disposed in the first space or the second space and is electrically connected to the pad. Based on the above, the thermistor of the quartz resonator of the disclosure is disposed in the casing, and is closer to the oscillator crystal in the casing, thereby precisely measuring the temperature of the oscillator crystal.
Data Source
AI summary
A quartz resonator including a casing, a pad, an oscillator crystal and a thermistor is provided. The casing includes a first casing and a second casing. The pad is disposed on an outer surface of the second casing. The oscillator crystal includes two thick parts and a thin part whose two ends are respectively connected to the two thick parts. The two thick parts are sandwiched between the first casing and the second casing. An inner surface of the first casing and the thin part of the oscillator crystal form a sealed first space, and an inner surface of the second casing and the thin part of the oscillator crystal form a sealed second space. The thermistor is disposed in the first space or the second space and is electrically connected to the pad.