Notched Quartz Oscillating Plate for Higher Q Value
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Solution Overview
Problem
Conventional quartz oscillating plates have limitations in achieving high Q values and crystal impedance, which affect their accuracy and efficiency in frequency control.
Innovation Solution
A quartz oscillating plate with a notch structure is designed to increase the length of the signal transmission path, utilizing photolithographic and etching technologies to enhance the Q value by varying the included angles and depth of the notch, and incorporating side-electrodes and protrudent platforms for efficient energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional quartz oscillating plate structure is used, then the manufacturing process is simple, but the Q value is low
Solution Approach 1:
The substrate is divided into multiple regions by introducing notches, which segment the vibration path and increase the signal transmission path length. This segmentation allows the vibration energy to be distributed more effectively, increasing the Q value from conventional levels to 50.5k or higher while maintaining a manageable structural complexity through standardized notch patterns.
2Loss of energy
If the transmission path length is increased, then the Q value improves, but the device volume increases
Solution Approach 1:
The notches are strategically positioned within the substrate to create nested vibration paths that fold back on themselves. This nesting approach allows the transmission path to be extended significantly within a compact footprint, achieving high Q values without proportionally increasing the overall device volume.
Solution Approach 2:
The notches introduce vertical dimensionality to the transmission path by creating multi-level vibration routes within the substrate thickness. This dimensional transformation allows the path length to be extended in the vertical and lateral directions simultaneously, increasing Q value while controlling the horizontal device footprint.
3Manufacturing precision
If photolithographic and etching methods are used to create notches, then manufacturing precision improves, but the manufacturing complexity increases
Solution Approach 1:
Traditional mechanical cutting methods are replaced with photolithographic patterning and chemical etching processes. This substitution enables much higher precision in defining the notch geometry, position, and dimensions, which is critical for achieving the targeted Q value of 50.5k. The photolithographic approach provides sub-micron precision that mechanical methods cannot achieve, while the etching process cleanly defines the notch boundaries.
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 notch structure significantly increases the Q value of the quartz oscillating plate, achieving a Q value of 50.5 (k), which is higher than conventional plates, and enables stable and accurate frequency control with improved performance.
Implementation Method 1
Based on the piezoelectric effect, a quartz oscillating plate can generate oscillation with a specified frequency at high accuracy
Data Source
AI summary
A quartz oscillating plate comprises a substrate having a notch. Two sides of the notch respectively have a first side-electrode and a second side-electrode. The first side-electrode receives an external signal. The external signal is transmitted along the perimeter of the substrate. The notch of the substrate can increase the length of the transmission path of oscillation energy. The present invention can improve the Q value of the quartz oscillator using the quartz oscillating plate and optimize the performance of the products using the quartz oscillator.