Quartz Vibrator Mounting Layout for Stable Resonance Frequency
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Solution Overview
Problem
Existing vibrator devices experience fluctuations in frequency characteristics due to stress generated from differences in linear expansion coefficients between components, affecting resonance frequency stability.
Innovation Solution
A vibrator device design featuring metal bumps disposed on specific inclination angles relative to the X-axis of the quartz crystal element, with a relay board and circuit element attached via additional metal bumps, reduces stress and enhances temperature compensation, thereby stabilizing resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If metal bumps are disposed considering the directionality of linear expansion coefficient difference, then stress generated in metal bump is reduced, but frequency characteristics still fluctuate due to stress sensitivity relationship not being considered
Solution Approach 1:
The patent changes the orientation parameter of metal bumps from conventional alignments (parallel/perpendicular to X-axis) to specific inclined orientations (±45° to ±65° relative to X-axis). This parameter change optimizes the stress distribution by considering both linear expansion coefficient differences and stress sensitivity characteristics of the piezoelectric substrate, thereby reducing frequency characteristic fluctuations while managing thermal stress.
2Stress or pressure
If metal bump orientation is optimized for linear expansion stress reduction, then stress in metal bump decreases, but stress sensitivity relationship between piezoelectric substrate and metal bump is not considered
Solution Approach 1:
The patent optimizes the orientation parameter of metal bumps to specific inclination angles (±45° to ±65°) relative to the X-axis of the piezoelectric substrate. This parameter optimization simultaneously addresses both stress reduction from linear expansion differences and frequency characteristics control by considering the stress sensitivity characteristics of the piezoelectric material.
3Ease of manufacture
If conventional metal bump arrangement is used, then manufacturing is simpler, but frequency characteristics fluctuate due to unconsidered stress sensitivity
Solution Approach 1:
The patent specifies precise orientation parameters for metal bump arrangement (inclination angles of ±45° to ±65° relative to the X-axis). While this requires more precise manufacturing control compared to conventional arrangements, it significantly improves resonance frequency stability by optimizing the relationship between stress distribution and piezoelectric substrate stress sensitivity characteristics.
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 minimizes resonance frequency fluctuations and improves temperature accuracy detection, leading to enhanced performance in electronic apparatuses and vehicles.
Implementation Method 1
stress generated in the element due to the difference in the linear expansion coefficient between the base and the vibrator element
Implementation Method 2
the quartz crystal vibrator element is an AT-cut quartz crystal board... it is possible to realize the vibrator element in which the thickness sliding vibration is excited
Data Source
AI summary
A vibrator device includes a base; and a vibrator element including a quartz crystal vibrator element attached to the base via a first metal bump, in which the first metal bump is disposed on a straight line inclined within a range of +55° to +65° or −65° to −55° with respect to an X axis of the quartz crystal constituting the quartz crystal vibrator element in plan view seen from a direction in which the base and the quartz crystal vibrator element are arranged.