Quartz Resonator Package Layout for Stable Frequency-Temperature Response
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Solution Overview
Problem
Existing resonator devices face challenges in maintaining a good frequency-temperature characteristic due to large temperature differences between the resonator element and the thermo-sensitive component, especially when mounted on external members like electronic apparatuses, where adiabatic effects of air accumulation lead to increased temperature differences.
Innovation Solution
The resonator device is configured with a substrate having a specific distance between the electrode terminals and the electronic element, promoting air flow and reducing temperature differences. This configuration includes a resonator element mounted on one surface of the substrate and an electronic element, such as a thermo-sensitive component, housed in a recessed section on the opposing surface, with electrode terminals connecting them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the distance from the mounting terminal to the thermo-sensitive component is increased, then the temperature difference between the resonator element and thermo-sensitive component increases due to adiabatic heating of accumulated air, but the frequency-temperature characteristic deteriorates
Solution Approach 1:
The patent extracts the harmful accumulated air from the second housing section by providing a communication hole that connects the second housing section to the external environment. This allows the accumulated air to escape and be replaced by external air, eliminating the adiabatic heating effect that causes temperature differences between the resonator element and thermo-sensitive component.
Solution Approach 2:
The communication hole acts as an intermediary channel between the second housing section and the external environment. It mediates the air flow, allowing external air to enter and replace the accumulated air inside the housing section, thereby preventing temperature differences without requiring direct contact between components.
2Adaptability or versatility
If the resonator device is mounted on an external member, then the device can be integrated into electronic apparatus, but the temperature difference increases due to air accumulation in the second housing section
Solution Approach 1:
The patent removes the harmful accumulated air from the second housing section through the communication hole, preventing adiabatic heating that would otherwise occur when the device is mounted on external members. This maintains temperature uniformity while preserving mounting versatility.
Solution Approach 2:
The patent uses pneumatic principles by establishing air flow through the communication hole. The air flow replaces the accumulated air in the second housing section with external air, using pressure differences to eliminate the harmful air accumulation that causes temperature differences during mounting.
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 the temperature difference between the resonator element and the thermo-sensitive element, thereby improving the frequency-temperature characteristic of the resonator device while also allowing for height reduction and enhanced self-alignment effects.
Implementation Method 1
the temperature difference between the temperature of the piezoelectric vibration element and the temperature detected by the thermo-sensitive component in the period when, for example, the temperature falls become large due to the adiabatic effect of the air, which is accumulated in the second housing section
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.