Tuning Fork Crystal Blank Cutaway Support for Frequency Stability
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Solution Overview
Problem
Existing tuning fork type crystal elements face challenges in achieving stable mechanical vibration and efficient electrical characteristics due to interference between bending vibrations in the support and vibrating parts, leading to frequency instability and degradation of electrical properties.
Innovation Solution
The design incorporates a tuning fork type crystal blank with a support part and protruding parts having cut away sections, which reduce bending vibrations in the support part while maintaining the frequency stability of the vibrating parts, achieved through specific etching and metal pattern configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the support part is extended to provide adequate support for the crystal element, then the mechanical stability is improved, but the bending vibrations in the support part increase and interfere with the vibrating parts, causing frequency instability
Solution Approach 1:
The support part is divided into multiple protruding parts that are spatially separated from each other. This segmentation allows each protruding part to provide localized support while minimizing the overall bending vibration amplitude. The cut away parts further segment the structure to reduce vibration interference with the vibrating parts, thus maintaining frequency stability while providing adequate mechanical support.
Solution Approach 2:
The crystal blank has different structural characteristics in different regions: the base part has high rigidity for overall stability, the vibrating parts have specific geometry for resonance, the holding part provides secure attachment, and the support part with protruding parts and cut away parts provides localized support with minimized vibration. This local quality optimization ensures each region performs its specific function while minimizing negative interactions.
2Ease of manufacture
If the crystal blank structure is simplified for ease of manufacture, then the manufacturing process is easier, but the ability to reduce bending vibrations and maintain frequency stability is compromised
Solution Approach 1:
The protruding parts and cut away parts are formed during the crystal blank fabrication process itself, before the metal patterns are applied. This preliminary structuring of the support part allows the bending vibrations to be reduced at the source, ensuring frequency stability is built into the fundamental structure. The etching process that forms these features can be integrated into existing manufacturing workflows, maintaining ease of manufacture while achieving vibration reduction.
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 enhances frequency stability and reduces electrical degradation by minimizing interference between bending vibrations, thereby improving the performance of the tuning fork type crystal element.
Implementation Method 1
a tuning fork type crystal element is configured by a tuning fork type crystal blank and metal patterns which are formed on the surface of the crystal blank
Data Source
AI summary
A tuning fork type crystal blank includes a base part, a pair of vibrating parts which extend from the base part parallel with each other, an auxiliary part including a support part located on one side of an alignment direction of the pair of vibrating parts relative to the base part and pair of vibrating parts and extending parallel with the pair of vibrating parts, and a holding part which is located on the opposite side to the pair of vibrating parts relative to the base part and connects the base part and the support part. When viewed in a planar view direction perpendicular to the alignment direction and to the direction in which the pair of vibrating parts extend, cut away part is formed in a side surface of the auxiliary part.