Quartz Resonator Package Layout for Accurate Temperature Sensing
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Solution Overview
Problem
Existing resonator devices face issues with temperature differences between the resonator element and the thermo-sensitive component, leading to poor frequency-temperature characteristics due to adiabatic effects and air accumulation, which can cause 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 be equal to or greater than 0.05 mm, and the distance from the electrode terminals to the bottom surface of the recessed section is shorter than 0.3 mm, promoting air flow and reducing temperature delays, while the distance between the center lines of the resonator and thermo-sensitive elements is within 0.18 to 0.32 mm, and a projecting electrode terminal with a curved contour is used for self-alignment and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the distance from the mounting terminal to the thermo-sensitive component is large, then the device structure is simpler, but the temperature difference between the resonator element and thermo-sensitive component increases due to adiabatic effects
Solution Approach 1:
The patent introduces asymmetric structural features including a projecting section on one electrode terminal that extends beyond other terminals, and positions the thermo-sensitive component offset from the center of the resonator element. This asymmetric arrangement creates specific air flow patterns that reduce adiabatic heating effects while maintaining structural simplicity.
Solution Approach 2:
The patent utilizes the thickness dimension (Z-axis) by positioning the thermo-sensitive component at a specific distance from the mounting surface (0.05mm to 0.3mm), creating a three-dimensional arrangement that optimizes thermal coupling. This dimensional approach allows air to circulate effectively without requiring complex planar structures.
2Ease of operation
If the distance between electrode terminals and thermo-sensitive element is increased, then mounting is easier, but temperature detection accuracy deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges: the distance from the mounting surface to the thermo-sensitive component is controlled at 0.05mm to 0.3mm, and the distance from the resonator element center to the thermo-sensitive component center is 0.18mm to 0.32mm. These parameter optimizations ensure both ease of mounting and accurate temperature detection by balancing accessibility with thermal coupling efficiency.
3Reliability
If air accumulates in the second housing section, then the structure is sealed and protected, but temperature response delay increases due to adiabatic heating
Solution Approach 1:
The patent extracts the harmful adiabatic heating effect by introducing air flow pathways through the recessed section structure. The thermo-sensitive component is positioned in a recessed area that allows air to circulate, effectively removing the stagnant air accumulation that causes adiabatic heating while maintaining the sealed protective housing structure.
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, resulting in improved frequency-temperature characteristics and height reduction, while ensuring accurate temperature detection and efficient mounting processes.
Implementation Method 1
the flow of the air in the recessed section is promoted, and thus, the delay of the temperature drop of the electronic element due to the accumulation of the air in the recessed section can be reduced
Implementation Method 2
a piezoelectric device provided with a piezoelectric vibration element
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.