Quartz Resonance Electrode Indentation for Vibration Stability
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Solution Overview
Problem
Quartz crystal devices face challenges in maintaining stability and reliability in vibration environments due to inadequate structural design, leading to issues with frequency instability and oscillation strength.
Innovation Solution
The design incorporates a crystal chip with a specific geometrical shape for the excitation electrode, featuring an electrode indentation boundary that encompasses the support surface portion, optimizing the electrode area and indentation area ratio between 0.05 to 0.2, to enhance oscillation stability and maintain the original product properties under vibration conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the excitation electrode uses a conventional geometrical shape, then the manufacturing process is simple, but the oscillation stability and frequency consistency deteriorate in vibration environments
Solution Approach 1:
The excitation electrode is designed with a specific geometrical shape where a portion of the electrode overlaps with the support surface portion of the crystal chip. This local geometric configuration creates a specific indentation region that enhances oscillation stability without complicating the overall manufacturing process. The local quality change in the electrode shape directly addresses the reliability issue in vibration environments.
2Power
If the electrode area is increased to improve excitation strength, then the excitation capability is enhanced, but the frequency consistency and oscillation stability worsen
Solution Approach 1:
The patent optimizes the ratio between the electrode area and the indentation area formed by the electrode overlapping with the support surface portion. By controlling this geometric parameter ratio, the design achieves both sufficient excitation strength and frequency consistency. The specific indentation geometry modifies the stress distribution and excitation field without simply increasing the overall electrode area.
3Ease of manufacture
If the crystal chip structure is simplified for ease of manufacture, then the production cost is reduced, but the ability to withstand vibration and maintain stability deteriorates
Solution Approach 1:
The bearing structure is designed to support the crystal chip at multiple points including the support surface portion that overlaps with the excitation electrode. This distributed support configuration creates equipotential stress distribution across the crystal chip, enhancing vibration resistance without requiring complex chip structures. The support points are strategically positioned to maintain mechanical stability while preserving manufacturing simplicity.
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 improves the quartz crystal device's ability to operate reliably in vibration environments by stabilizing oscillations and maintaining frequency stability, while allowing for increased design flexibility and anti-drop strength.
Implementation Method 1
A quartz crystal device can be used to generate a reference signal
Data Source
AI summary
A resonance element supported by a bearing structure includes a crystal chip and an excitation electrode. The crystal chip includes a main surface having a support surface portion being in contact with the bearing structure. The excitation electrode is disposed on the main surface, has an electrode area, and includes an electrode indentation boundary partly encompassing the support surface portion. The electrode indentation boundary has a first boundary end and a second boundary end being opposite to the first boundary end. The electrode indentation boundary and a reference line segment defined by the first and the second boundary ends form an electrode indentation region having an indentation area. A ratio of the indentation area to the electrode area ranges from 0.05 to 0.2.