Quartz Crystal Cut Angles for Wide-Temperature Frequency Stability
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Solution Overview
Problem
Existing quartz crystal resonators fail to maintain stable vibration frequency deviation over wide operating temperature ranges, particularly in extreme environments, failing to meet industrial standards for accuracy and stability.
Innovation Solution
A quartz crystal resonator is manufactured by cutting a quartz bar at specific angles, including a first angle of about 35 to 36 degrees with the optic axis and a second angle of about 10 to 12 degrees with the electrical axis, ensuring a vibration frequency deviation within ±20 ppm from −40°C to 125°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quartz crystal cutting angles are used, then manufacturing simplicity is maintained, but vibration frequency stability over wide temperature ranges deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely adjusting the quartz crystal cutting angles (first angle θ: 35-36 degrees, second angle φ: 10-12 degrees) to optimize vibration frequency stability across wide temperature ranges. This resolves the contradiction by transforming the cutting parameters to achieve both reliability improvement and acceptable manufacturing complexity.
2Adaptability or versatility
If quartz crystal is cut at standard angles, then manufacturing process simplicity is maintained, but temperature range adaptability deteriorates
Solution Approach 1:
The patent changes the cutting angle parameters from standard values to optimized values (θ: 35-36 degrees, φ: 10-12 degrees) to expand temperature range adaptability from typical ±40°C to −40°C to 125°C. This resolves the contradiction by accepting increased manufacturing precision requirements in exchange for significant adaptability improvement.
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 method provides quartz crystal resonators with improved stability and accuracy over a wide temperature range, meeting stringent industrial standards and enabling applications in harsh environments.
Implementation Method 1
a quartz crystal resonator includes a quartz crystal cut from a quartz bar
Data Source
AI summary
A quartz crystal resonator including a quartz crystal obtained from a quartz bar is provided. The quartz crystal is cut from the quartz bar along a cutting plane in a coordinate system having an optic axis, an electrical axis and a mechanical axis perpendicular to each other. The cutting plane has a first angle of about 35° to about 36° from the optic axis and a second angle of about 14° to about 16° from the electrical axis. The quartz crystal has a vibration frequency deviation within a range from −30 parts per million (ppm) to about +30 ppm over a temperature range from about −50° C. to about 150° C. Methods for making the quartz crystal resonator are also provided.