Crystal Resonator Packaging With Serpentine Vibration Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional packaging structures for quartz resonators transmit external mechanical vibrations and sudden shocks to the resonant crystal, leading to unstable resonant frequencies due to a higher area ratio of the supporting portion to the quartz crystal resonator element.
Innovation Solution
A vibration-absorbing structure is designed with a package base, a resonant crystal blank, and a top cover, featuring a serpentine connection area between the border and resonant areas to absorb external mechanical vibrations and sudden shocks, thereby stabilizing the resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional packaging structure with casings is used to protect the quartz crystal resonator element, then the structural support is provided, but external mechanical vibrations and sudden shocks are transmitted to the main vibrating portion causing unstable resonant frequency
Solution Approach 1:
The resonant crystal blank is divided into functionally distinct areas: a border area for mechanical support, a resonant area for frequency generation, and a serpentine connection area linking them. This segmentation allows the border area to provide structural strength while the serpentine connection area isolates the resonant area from external vibrations, resolving the contradiction between structural support and frequency stability.
Solution Approach 2:
The serpentine connection area acts as an intermediary element between the border area and the resonant area. It transmits necessary mechanical support while filtering out harmful vibrations through its serpentine geometry, which absorbs and dissipates vibrational energy. This intermediary structure enables both structural support and vibration isolation simultaneously.
2Strength
If the area ratio of the supporting portion to the quartz crystal resonator element is high, then structural support is enhanced, but external mechanical vibrations are more easily transmitted to the main vibrating portion
Solution Approach 1:
Different areas of the resonant crystal blank are given different functional qualities: the border area has high structural quality for support, the serpentine connection area has vibration-absorbing quality with its curved geometry, and the resonant area has high frequency-stability quality. This local differentiation allows the structure to provide support while minimizing vibration transmission to the resonant portion.
Solution Approach 2:
The serpentine connection area employs curved, serpentine geometry instead of straight lines. This curvature allows the connection area to flex and absorb vibrational energy through deformation, reducing the transmission of mechanical shocks and vibrations from the border area to the resonant area, thereby protecting the resonant frequency from external disturbances.
3Strength
If a rigid connection structure is used between the supporting portion and the resonant area, then mechanical strength is improved, but vibration isolation is reduced
Solution Approach 1:
The connection structure transitions from a static, rigid design to a dynamic serpentine configuration. The serpentine connection area can deform elastically in response to external vibrations and shocks, absorbing energy through controlled deformation while maintaining mechanical connectivity. This dynamic behavior provides both structural strength and vibration isolation, as the flexible serpentine structure adapts to external forces without transmitting them directly to the resonant area.
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 serpentine connection area effectively prevents the transmission of external mechanical vibrations and sudden shocks to the resonant crystal blank, resulting in a stabilized resonant frequency.
Implementation Method 1
The serpentine connection area is connected between the border area and the edge of the resonant area... the serpentine connection area effectively prevents the transmission of external mechanical vibrations and sudden shocks to the resonant crystal blank
Data Source
AI summary
A vibration-absorbing structure for packaging a crystal resonator includes a package base, a resonant crystal blank, and a top cover. The top of the package base has a recess. The sidewall of the package base surrounds the recess. The resonant crystal blank has a border area, at least one serpentine connection area, and a resonant area. The serpentine connection area is connected between the border area and the edge of the resonant area. The border area is arranged on the sidewall. The top cover, arranged on the border area, covers the recess, the at least one serpentine connection area, and the resonant area.