Quartz Resonator Element Thickness and Width Ratio Optimization
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Solution Overview
Problem
Resonator elements using quartz crystals face challenges in maintaining impact resistance while minimizing vibration leakage, as existing designs are prone to breakage and have unclear thickness-to-width ratios that affect performance.
Innovation Solution
A resonator element design with specific thickness and width ratios for the base and coupling portions, along with grooves on the vibrating arms, to enhance both impact resistance and vibration characteristics, and a package configuration that reduces air resistance and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the coupling portion width is reduced to suppress vibration leakage, then vibration leakage is reduced, but impact resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing specific numerical ranges for the thickness T (110-210 μm) and width ratio W2/W1 (0.469-0.871) of the resonator blank. These parameter optimizations simultaneously achieve vibration leakage suppression and impact resistance enhancement, resolving the technical contradiction between reducing coupling portion width and maintaining structural strength.
2Strength
If the thickness of resonator blank is increased to improve impact resistance, then impact resistance is improved, but device size and complexity increase
Solution Approach 1:
The patent optimizes the thickness parameter T within the range of 110-210 μm, finding the optimal balance point where sufficient impact resistance is achieved without excessive thickness. This parameter optimization resolves the contradiction between improving impact resistance through increased thickness and avoiding excessive device complexity.
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 design achieves improved vibration characteristics and impact resistance by optimizing the thickness and width ratios of the resonator elements and incorporating grooves, resulting in a more reliable resonator element for electronic devices and mobile objects.
Implementation Method 1
resonator element using a quartz crystal have been known. Such resonator elements have excellent frequency-temperature characteristics
Implementation Method 2
a resonator element having excellent impact resistance while reducing vibration leakage
Data Source
AI summary
A resonator element includes a quartz crystal resonator blank provided with a base portion, vibrating arms extending from one end side of the base portion, a connecting portion which is disposed on the other end side of the base portion, and a coupling portion, located between the base portion and the connecting portion, which couples the base portion to the connecting portion. When a thickness of the quartz crystal resonator blank is set to T, a width of the base portion is set to W1, and a width of the coupling portion is set to W2, a relation of 110 μm≦T≦210 μm is satisfied, and a relation of 0.469≦W2/W1≦0.871 is satisfied.