Quartz Crystal Blank Area Ratio for CI and Vibration Balance
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Solution Overview
Problem
Existing quartz crystal devices face a trade-off between improving crystal impedance (CI) characteristics and reducing the impact of vibration noise, particularly in compact designs required for modern communication systems like 5G base stations and IoT devices, where smaller sizes worsen CI characteristics while larger sizes are more susceptible to vibration noise.
Innovation Solution
A quartz crystal device design where the area of the flat surface of the crystal blank is between 10% and 30% of the package's flat surface area, specifically 13% to 18%, with the blank adhered to a pedestal at four points, enhancing CI characteristics and reducing vibration noise deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the blank size is increased to improve CI characteristics, then the CI characteristic improves, but the vibration noise resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the blank area ratio within a specific range (10%-30%) to simultaneously improve CI characteristics and vibration noise resistance. This quantitative parameter optimization resolves the trade-off by identifying a sweet spot where both requirements are satisfied
Solution Approach 2:
The patent uses a composite structure combining the crystal blank with the pedestal and adhesive agent. This composite design allows the system to achieve both good CI characteristics and vibration noise resistance through the synergistic effect of different materials and their interfaces
2Object-affected harmful factors
If the blank size is decreased to improve vibration noise resistance, then the vibration noise resistance improves, but the CI characteristic deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of blank area ratio to a specific range (10%-30%), which simultaneously achieves both vibration noise resistance and acceptable CI characteristics, avoiding the need to sacrifice one for the other
3Volume of moving object
If the package size is reduced for downsizing applications, then the device size is reduced, but the CI characteristic deteriorates
Solution Approach 1:
The patent applies parameter changes by defining the blank area ratio relative to the package area (10%-30%), which allows the design to maintain good CI characteristics even in downsized packages. This relative parameter approach enables scaling while preserving performance
Solution Approach 2:
The patent applies local quality by optimizing the distribution of the blank within the package footprint. By controlling the blank area ratio and its placement, the design achieves efficient space utilization that maintains CI characteristics in compact packages
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 design effectively improves CI characteristics while minimizing the adverse effects of vibration noise, providing a balanced performance suitable for high-stability applications in diverse installation environments.
Implementation Method 1
a crystal blank (20) mounted to a pedestal (11) inside the package (10)
Data Source
AI summary
A quartz crystal device includes a package and a crystal blank mounted inside the package. An area of a flat surface of a mounted surface of the blank is 10% or more and 30% or less with respect to an area of a flat surface specified by a width and a depth of the package.