Quartz Resonator Reverse-Side Thermistor Layout for Frequency Stability
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Solution Overview
Problem
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 and air accumulation, which can result in significant frequency deviations when temperature changes occur.
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 (equal to or greater than 0.05 mm and less than 0.3 mm) to promote air flow and reduce temperature differences, using a thermo-sensitive element like a thermistor or temperature measuring semiconductor to accurately detect ambient temperature, and incorporating a projecting electrode terminal for self-alignment and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance from the mounting terminal to the thermo-sensitive component is large, then the adiabatic effect of accumulated air is reduced, but the device height increases
Solution Approach 1:
The patent positions the thermo-sensitive component on the reverse surface of the substrate rather than directly below the resonator element, changing the spatial arrangement from a vertical stacking approach to a distributed layout. This dimensional reorganization allows the temperature sensing function to be performed at a distance from the resonator while maintaining a compact overall device profile, resolving the contradiction between reducing adiabatic effects and minimizing device height.
2Reliability
If the distance between the resonator element and thermo-sensitive component is increased, then temperature difference is reduced, but the device complexity increases
Solution Approach 1:
The substrate serves multiple functions simultaneously: it provides mechanical support for the resonator element, conducts heat from the resonator to the thermo-sensitive component through its thermal conduction properties, and provides an mounting platform for both components. This multi-functionality allows the temperature sensing to be performed at an optimized distance without requiring additional thermal coupling structures, thereby reducing device complexity while maintaining temperature detection accuracy.
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 enabling accurate temperature detection, while also allowing for a compact design and enhanced mounting efficiency.
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 and a first wiring pattern
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.