AT-Cut Quartz Blank Air-Gap Electrode Structure Against Fragmentation
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Solution Overview
Problem
Existing quartz crystal resonators face fragmentation issues due to mass loading effects when electrodes are connected to the thinned quartz blank, limiting their ability to operate at ultra-high frequencies.
Innovation Solution
The design incorporates a first electrode on one side of the quartz blank with a connecting wafer forming a connecting chamber for a second electrode, creating an air gap electrode structure that reduces the mass load effect by connecting the second electrode indirectly through the wafer, and includes a supporting wafer to enhance structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the thickness of the quartz blank is reduced to achieve higher frequency, then the frequency of the quartz crystal resonator is improved, but the quartz blank becomes prone to fragmentation due to mass loading effect
Solution Approach 1:
A connecting wafer is introduced as an intermediary component between the quartz blank and the second electrode. The connecting wafer includes a connecting chamber that holds the second electrode, isolating it from direct contact with the quartz blank surface. This mediator structure eliminates the mass loading effect while maintaining electrical connection through the connecting electrodes, thereby preventing quartz blank fragmentation at ultra-high frequencies.
2Speed
If the thickness of the quartz blank is reduced to achieve higher frequency, then the frequency of the quartz crystal resonator is improved, but the structural strength of the quartz blank deteriorates
Solution Approach 1:
The electrode assembly is segmented into two separate electrodes: the first electrode directly connected to the quartz blank and the second electrode housed in the connecting chamber. This segmentation allows the second electrode to be isolated from the thinned quartz blank structure, reducing stress concentration and preventing structural failure while maintaining the high-frequency operation capability.
3Ease of operation
If electrodes are connected to both sides of the thinned quartz blank, then the inverse piezoelectric effect is achieved, but the mass loading effect causes fragmentation
Solution Approach 1:
The connecting wafer serves as a mediator that enables the second electrode to be electrically connected to the quartz blank without direct physical contact. The connecting electrodes transmit electrical signals through the connecting wafer to the second electrode in the connecting chamber, achieving the inverse piezoelectric effect while eliminating the mass loading effect that would otherwise cause fragmentation.
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 minimizes the mass load effect on the thinned quartz blank, reducing fabrication difficulties and enhancing the structural integrity of ultra-high frequency quartz blanks.
Implementation Method 1
the first electrode and the second electrode form an inverse piezoelectric effect under the action of an alternating electric field
Data Source
AI summary
Disclosed is an ultra-high frequency AT-cut quartz blank and manufacturing method thereof. The ultra-high frequency AT-cut quartz blank comprises a vibrating blank, an electrode assembly and a connection assembly, one side of the vibrating blank is provided with a first groove; the electrode assembly comprises a first electrode, a connecting blank, and a second electrode; the connection assembly comprises a first connecting electrode and a second connecting electrode, the first connecting electrode is electrically connected to the first electrode, the second connecting electrode is electrically connected to the second electrode and extends to the outer wall of the connecting wafer, so that the first electrode and the second electrode form an inverse piezoelectric effect under the action of an alternating electric field. this disclosure can solve the problem of fragmentation or fragmentation of quartz blank.