Quartz Vibrator Support Layout for Reduced Thermal Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quartz crystal vibrators experience hysteresis and frequency changes due to thermal distortion caused by differences in thermal expansion coefficients between the quartz crystal and its supporting components, leading to unstable vibration characteristics.
Innovation Solution
A vibrator device design with a supporting member and substrate configuration where the area of the attaching portion is smaller than the fixed portion, made of the same material, and having different crystal orientations, to reduce thermal stress-induced distortion and maintain mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the quartz crystal vibrator is supported by a conductive adhesive or supporting portion made of different material, then the mechanical strength and attachment are improved, but thermal distortion and hysteresis occur due to difference in thermal expansion coefficient
Solution Approach 1:
The supporting member is made of the same material as the quartz crystal vibrator element, ensuring homogeneous thermal expansion characteristics. This eliminates the thermal distortion and hysteresis that occur when different materials with different thermal expansion coefficients are joined, while still providing the necessary mechanical support and attachment strength.
Solution Approach 2:
The invention changes the material parameter of the supporting member to match the quartz crystal vibrator element. By selecting a material with identical thermal expansion coefficient and elastic modulus, the thermal and mechanical parameters are optimized to prevent frequency drift and hysteresis during temperature cycling.
2Reliability
If the supporting member area is increased to reduce thermal stress, then thermal distortion is reduced, but the device size increases
Solution Approach 1:
By changing the material parameters of the supporting member to match the quartz crystal vibrator element, the invention achieves thermal stress resistance without increasing the supporting member area. The matched thermal expansion coefficient and elastic modulus allow a compact design that provides sufficient thermal and mechanical support.
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 design effectively alleviates thermal stress-induced distortion, stabilizes vibration characteristics, and reduces frequency changes, resulting in a more reliable oscillator and gyro sensor performance.
Implementation Method 1
the hysteresis occurs due to an occurrence of a thermal distortion caused by a difference in a thermal expansion coefficient with a container (package) in a supporting portion supporting a quartz crystal vibrator element
Implementation Method 2
a quartz crystal oscillator mounting a vibrator, particularly, a quartz crystal vibrator is used widely as a reference frequency source
Data Source
AI summary
A vibrator device includes a vibration element including a vibration portion and a fixed portion, a supporting member to which the fixed portion is attached to support the vibration element, and a first substrate to which the supporting member is attached, the supporting member includes a attaching portion attached to the first substrate, and A1≥A2 is satisfied in a case where an area of a rectangular region including the fixed portion is A1 and an area of a rectangular region including the attaching portion is A2 in a plan view seen from a thickness direction of the vibration element.