Quartz Vibration Element Mass Balancing for Noise Leakage
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Solution Overview
Problem
Existing tuning fork type quartz crystal vibrator elements suffer from noise vibrations due to the leakage of vibration components in the thickness direction, which affects the accuracy and reliability of devices using these elements.
Innovation Solution
A vibration element design that includes a base, a vibrating arm with a weight positioned closer to the tip end, and a weight film disposed on the weight. The weight and weight film are configured such that their centers of gravity are positioned closer to the first and second principal surfaces, respectively, relative to the center plane of the arm, thereby reducing unnecessary vibrations and noise leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a weight and metal film are provided in the vibrating arm structure, then frequency adjustment capability is improved, but the center of gravity shifts in the thickness direction causing out-of-plane vibrations and noise leakage
Solution Approach 1:
The patent introduces a counterweight structure that is positioned offset from the center plane in the thickness direction to compensate for the center of gravity shift caused by the weight and metal film. This counterweight creates a balancing effect that restores the overall center of gravity to the center plane, thereby preventing out-of-plane vibrations and noise leakage while maintaining frequency adjustment capability.
Solution Approach 2:
The patent employs asymmetric positioning of the counterweight relative to the center plane, deliberately creating an asymmetric mass distribution that compensates for the asymmetric shift caused by the weight and metal film. This asymmetric design allows precise control of the center of gravity position to eliminate harmful vibrations.
2Manufacturing precision
If the center of gravity is positioned closer to the first principal surface side than the center plane, then the weight structure provides frequency adjustment, but out-of-plane vibrations are generated during in-plane vibration
Solution Approach 1:
The counterweight is strategically positioned to offset the center of gravity shift, ensuring that the combined center of gravity of the weight and counterweight returns to the center plane. This maintains stable in-plane vibration modes and prevents generation of unstable out-of-plane vibrations during operation.
Solution Approach 2:
The patent adjusts the mass and position parameters of the counterweight to precisely control the overall center of gravity location. By changing these parameters, the system achieves both accurate frequency control and stable vibration characteristics.
Data Source
AI summary
A vibration element includes a base and a vibrating arm extending from the base. The vibrating arm includes an arm positioned between the base and a weight. A weight film is disposed on the weight. The weight has a first principal surface and a second principal surface in a front and back relationship with respect to a center plane of the arm. A center of gravity of the weight is located between the first principal surface and the center plane of the arm. A center of gravity of the weight film is located between the second principal surface and the center plane of the arm.