Quartz Resonator Package Layout for Accurate Thermal Sensing
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Solution Overview
Problem
The existing resonator devices face issues with temperature differences between the piezoelectric vibration element and the thermo-sensitive component, leading to poor frequency-temperature characteristics due to adiabatic effects caused by air accumulation, which can result in significant frequency deviations when temperatures rise or fall.
Innovation Solution
The resonator device is designed with a specific configuration where the distance between the electrode terminals and the thermo-sensitive element is optimized to at least 0.05 mm, promoting air flow and reducing temperature delays, and the distance between the resonator element and the thermo-sensitive element is within a range that balances height reduction and temperature difference minimization, using a thermistor or temperature measuring semiconductor for accurate temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the mounting terminal and the thermo-sensitive component is large, then the frequency-temperature characteristic is improved, but the device height increases
Solution Approach 1:
The patent transitions from vertical stacking (thickness direction) to horizontal arrangement (length direction) by placing the resonator element and thermo-sensitive component side-by-side on the same substrate. This dimensional change allows adequate thermal coupling distance for frequency-temperature compensation while maintaining compact overall device height.
Solution Approach 2:
The patent introduces a heat-conduction section (thermal conductor) as an intermediary element between the mounting terminal and the thermo-sensitive component. This mediator facilitates efficient heat transfer from the resonator element to the thermo-sensitive component, ensuring accurate temperature detection for frequency compensation without requiring large physical distances.
2Length of stationary object
If the distance between the mounting terminal and the thermo-sensitive component is small, then the device height is reduced, but the temperature difference between the resonator element and the thermo-sensitive component increases due to adiabatic effect
Solution Approach 1:
The heat-conduction section serves as a thermal bridge that actively counteracts the adiabatic effect by providing a dedicated thermal conduction path. This intermediary ensures that even when components are positioned close together vertically, heat can efficiently transfer from the resonator element to the thermo-sensitive component through the conductive path, minimizing temperature differences.
Solution Approach 2:
The patent modifies the thermal conduction parameters by introducing a heat-conduction section with specific thermal conductivity characteristics. This parameter change enhances the thermal coupling between components, allowing the system to maintain accurate temperature detection despite reduced physical distance between the resonator element and thermo-sensitive component.
3Device complexity
If the air in the second housing section is accumulated, then the device structure is simplified, but the temperature detection accuracy deteriorates due to adiabatic heating during temperature changes
Solution Approach 1:
The heat-conduction section acts as a thermal mediator that bypasses the air-filled housing space. By providing a direct solid-state thermal conduction path between the resonator element and thermo-sensitive component, it eliminates reliance on air-mediated heat transfer, thereby preventing adiabatic heating effects while maintaining the simplified housing structure with air accumulation.
Solution Approach 2:
The patent replaces the air-based thermal conduction mechanism with a solid-state heat-conduction section. This substitution eliminates the adiabatic effects inherent in gas-filled spaces while maintaining the simplified housing structure, as the thermal coupling is achieved through direct solid contact rather than through the air medium.
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 reduces temperature differences between the resonator element and the thermo-sensitive element, thereby improving the frequency-temperature characteristic and ensuring accurate temperature detection, even under varying conditions, while allowing for a compact design.
Implementation Method 1
a piezoelectric device provided with a piezoelectric vibration element
Implementation Method 2
at least one of the mounting terminals and the first electrode pad are electrically connected to each other with a first heat-conduction section
Data Source
AI summary
A quartz crystal resonator includes a quartz crystal resonator element, a thermistor, and a package base having a first principal surface and a second principal surface having an opposed surface relationship with each other, the quartz crystal resonator element is mounted on the first principal surface side, the thermistor is housed in a recessed section of the second principal surface side of the package base, a plurality of electrode terminals connected to the quartz crystal resonator element or the thermistor is disposed on the second principal surface side of the package base, and a distance in a first direction perpendicular to the first principal surface from a mounting surface of the electrode terminals to the thermistor is equal to or longer than 0.05 mm.