Quartz Vibrator Layout for Suppressing Edge Contour Vibrations
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Solution Overview
Problem
Existing vibrator designs suffer from increased spurious contour vibrations near the outer circumferential edge, leading to deteriorated frequency characteristics due to inadequate fixation and support, particularly when the vibration element is supported at a single point or in the central part of the width direction.
Innovation Solution
A vibrator design featuring excitation electrodes on both principal surfaces, a fixation section electrically coupled to at least one excitation electrode via a wiring section, and a vibration attenuator disposed at the outer circumferential edge of the vibration element, supported by a coupling electrode on a substrate via a bonding material, which suppresses spurious vibrations by attenuating thermoelastic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vibration element is supported at a single point or in the central part of the width direction, then the device complexity is reduced, but the spurious contour vibrations increase and frequency characteristics deteriorate
Solution Approach 1:
The patent applies local quality by positioning vibration attenuators specifically at the outer circumferential edge of the vibration element, rather than uniformly across the entire structure. This localized approach targets the specific region where contour vibrations occur (the outer circumferential edge) and provides damping only where needed, thus improving frequency characteristics without significantly increasing overall device complexity.
2Stability of the object's composition
If the vibration element is supported at two points in the central part, then the support stability is improved, but the spurious contour vibrations still increase
Solution Approach 1:
The patent maintains the two-point support structure for stability while adding localized vibration attenuators at the outer circumferential edge. This combination preserves the support stability provided by the two-point configuration while addressing the contour vibration issue through localized damping at the problematic edge region.
Solution Approach 2:
The support structure is segmented into distinct functional zones: the two electrode pads in the central part provide support and electrical connection, while the vibration attenuators at the outer circumferential edge provide localized damping. This segmentation allows each component to perform its specific function optimally without interfering with the other.
3Ease of manufacture
If no vibration attenuator is provided, then the manufacturing process is simplified, but the contour vibrations near the outer circumferential edge increase
Solution Approach 1:
The vibration attenuators are applied locally only at the outer circumferential edge where contour vibrations occur, rather than throughout the entire vibration element. This localized application minimizes the additional manufacturing steps required while effectively targeting and suppressing the harmful spurious vibrations at their source region.
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 effectively reduces the influence of spurious contour vibrations, resulting in improved frequency characteristics with higher accuracy and stability, while also preventing water vapor infiltration and maintaining a stable internal atmosphere through a pressurized gas enclosure.
Implementation Method 1
a vibration element (10) as an AT-cut quartz crystal substrate in a package... an excitation electrode and an electrode pad, and the excitation electrode and the electrode pad are electrically coupled to each other... which excites a thickness shear vibration
Implementation Method 2
a support substrate (401) having a coupling electrode (403) which is electrically coupled to the fixation section via a bonding material, and which supports the vibration element
Implementation Method 3
a vibration attenuator disposed on at least one of the principal surfaces of the vibration element... which suppresses spurious vibrations by attenuating thermoelastic losses
Implementation Method 4
maintaining a stable internal atmosphere through a pressurized gas enclosure
Data Source
AI summary
A vibrator includes a vibration element having an excitation section which is provided with excitation electrodes, and which excites a thickness shear vibration, and a fixation section electrically coupled to at least one of the excitation electrodes, a vibration attenuator disposed on at least one of principal surfaces of the vibration element, and a support substrate having a coupling electrode which is electrically coupled to the fixation section, and which supports the vibration element, wherein the vibration attenuator is disposed at the fixation section side of the excitation electrodes, and at an outer circumferential edge side of the vibration element from the fixation section in a direction perpendicular to a direction in which the excitation electrodes and the fixation section are arranged side by side.