Quartz Crystal Electrode Layout for Stable High-Frequency Oscillation
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Solution Overview
Problem
Existing crystal vibration elements face challenges in maintaining stable oscillation frequency and temperature characteristics due to differences in thermal expansion coefficients between quartz crystals and electrode metals, leading to resonance distortion and increased power consumption.
Innovation Solution
The crystal vibration element features excitation electrodes with a rectangular shape, smaller than the crystal piece, positioned on opposite surfaces, with a specific aspect ratio of 1.993 to 2.525, reducing their size in the Za-axis direction while maintaining the same length in the X-axis direction, which minimizes the influence on the crystal piece's vibration and temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electrodes are made larger to improve electrical connection, then electrical conductivity is improved, but temperature characteristics deteriorate due to thermal expansion differences
Solution Approach 1:
The patent changes the geometric parameters of the electrodes, specifically setting the aspect ratio of the electrode in the plan view to be 2.0 or more. This parameter change optimizes the balance between electrical connection area and thermal influence on the crystal piece, improving temperature characteristics while maintaining adequate electrical conductivity.
2Reliability
If electrodes are made smaller to improve temperature characteristics, then temperature stability is improved, but electrical connection quality deteriorates
Solution Approach 1:
The patent identifies and optimizes the aspect ratio parameter of the electrode, setting it to 2.0 or more in the plan view. This specific parameter change ensures that the electrode maintains adequate electrical connection quality while being small enough to minimize thermal expansion influence on the crystal piece.
3Use of energy by moving object
If electrode size is increased to reduce power consumption, then power efficiency is improved, but oscillation frequency stability deteriorates
Solution Approach 1:
The patent changes the electrode's aspect ratio parameter to 2.0 or more, which optimizes the electrode size and shape to achieve a balance between power consumption and oscillation frequency stability. This parameter optimization ensures that the electrode is efficient in power usage while maintaining stable oscillation characteristics.
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 stabilizes oscillation efficiency and temperature characteristics, ensuring accurate frequency generation within the 50-100 MHz range, particularly around 76.8 MHz, by reducing the impact of thermal differences and power consumption.
Implementation Method 1
a crystal piece with an oscillation frequency in a range of 50 MHz or higher and 100 MHz or lower
Data Source
AI summary
A crystal vibration element includes a crystal piece with an oscillation frequency in a range of 50 MHz or higher and 100 MHz or lower and excitation electrodes positioned on opposite surfaces of the crystal piece in a one-to-one relation, the excitation electrodes each having a rectangular shape in a plan view and being smaller than the crystal piece. A length of each of the excitation electrodes in a first direction along a direction of an electrical axis of the crystal piece in the plan view is 1.993 or more and 2.525 or less times a width of each excitation electrode in a second direction perpendicular to the first direction.