Tuning-Fork Quartz Vibrator With Segmented Arms
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Solution Overview
Problem
Tuning-fork type quartz vibrators often experience deformation in their bending vibration mode, leading to unfavorable vibration characteristics despite the addition of side bars for enhanced mechanical strength.
Innovation Solution
The design incorporates a tuning-fork type quartz vibrator with a base section and vibrating arm sections featuring through-holes and crosspieces, where the effective excitation electrode ratio is maintained at no more than 0.97, and weights are integrated to improve vibration characteristics and suppress deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If side bars are added to enhance mechanical strength, then mechanical strength is improved, but vibration form deformation occurs leading to unfavorable vibration characteristics
Solution Approach 1:
The vibrating arm section is segmented into multiple sections by providing through-holes, which allows independent optimization of different regions. The first through-hole is positioned in a region where bending moment is small, while the second through-hole is positioned in a region where bending moment is large, enabling differentiated structural optimization that maintains both strength and vibration characteristics.
Solution Approach 2:
Different regions of the vibrating arm section are given different structural characteristics through strategic placement of through-holes. The first region (small bending moment) and second region (large bending moment) have different through-hole configurations, creating local quality variations that optimize both mechanical strength and vibration form integrity.
2Strength
If through-holes are provided in vibrating arm section, then mechanical strength is enhanced, but vibration form deformation occurs
Solution Approach 1:
The vibrating arm section is divided into multiple segments through the provision of through-holes, allowing the structure to maintain strength while accommodating the segmentation without excessive deformation. The strategic positioning of through-holes in regions with different bending moments enables this balanced design.
Solution Approach 2:
The structure implements local quality by positioning through-holes differently in various regions - the first through-hole in a region with small bending moment and the second through-hole in a region with large bending moment - thereby optimizing both strength and vibration form characteristics locally.
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 ensures more favorable vibration characteristics by maintaining the bending mode integrity and enhancing mechanical strength, while the weights help in miniaturization and stabilizing the resonant frequency.
Implementation Method 1
Applying alternating electric fields from the first and second vibration electrodes 1006, 1007 causes the vibrating arm segments on both the sides of the through-hole 1005 to expand and contract in an opposite phase to each other in the vibrating arm section 1003
Implementation Method 2
the vibrating arm section 1003 vibrates in a bending mode
Data Source
AI summary
A tuning-fork type quartz vibrator is disclosed that includes excitation electrodes and a tuning-fork type vibrating reed that is made of quartz and in which first and second vibrating arm sections are integrally joined to a base section. In each of the first and second vibrating sections, a plurality of through-holes and two or more crosspieces are provided. Further, an effective excitation electrode ratio is no more than 0.97, the effective excitation electrode ratio being expressed by (a total area of the excitation electrodes in a cross-section orthogonal to a second direction as a width direction of each of the first and second vibrating arm sections)/(an area of a region where the plurality of through-holes are provided in the cross-section orthogonal to the second direction as the width direction of each of the first and second vibrating arm sections).