Tuning Fork Resonator Plate Structure for Vibration Leak Suppression
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Solution Overview
Problem
Tuning fork-type piezoelectric resonator plates face challenges with vibration leakage and breakage due to increased length of joining portions, which hinders miniaturization and resistance to external forces.
Innovation Solution
A tuning fork-type piezoelectric resonator plate design featuring pronged portions and through holes with a spiral shape, positioned closer to the center line, reduces vibration leakage and enhances resistance to stress and external forces by gradually weakening vibrational energy propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tip portions of the joining portions are electromechanically joined to the base using a conductive material, then acoustic leaks are prevented, but the routing electrodes increase in length making it difficult to convey vibrations and the base portion becomes difficult to withstand vibration stress
Solution Approach 1:
The base portion is divided into multiple sections with through holes creating segmented regions. This segmentation allows the vibration path to be divided, preventing stress concentration in a single location while maintaining acoustic sealing through the conductive material filling the through holes.
Solution Approach 2:
The through holes are designed with curved or spiral wall surfaces instead of straight cylindrical shapes. This curvature distributes the vibration stress along the curved path, reducing stress concentration and improving the base portion's ability to withstand vibration while maintaining acoustic leak prevention.
2Reliability
If the joining portions are made long to reach the tip portions for joining, then acoustic leaks are prevented, but the mounting region increases hindering miniaturization
Solution Approach 1:
The through holes are positioned in the thickness direction of the base portion, utilizing the vertical dimension rather than extending the joining portions horizontally. This allows acoustic leak prevention without increasing the planar mounting region, enabling miniaturization while maintaining reliability.
3Strength
If the through holes are positioned closer to the center line, then vibration stress resistance is improved, but the routing path for electrodes becomes more complex
Solution Approach 1:
The through holes serve multiple functions simultaneously: they act as acoustic barriers to prevent leaks, provide structural reinforcement to withstand vibration stress, and serve as pathways for electrode routing. This multi-functionality simplifies the overall design despite the central positioning of the holes.
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 suppresses vibration leakage and improves durability by distributing stress and vibrational energy, allowing for miniaturization without expanding the joining portion length.
Implementation Method 1
a wall surface of the through holes being formed in a spiral shape
Implementation Method 2
tuning fork-type piezoelectric resonator plate used in an electronic device or the like
Data Source
AI summary
A tuning fork-type piezoelectric resonator plate has a resonator blank comprising a pair of vibrating leg portions and a base portion from which the leg portions protrude. The pair of leg portions are arranged in parallel protrudingly from one end face of the base portion, and a pronged portion is formed between the pair of leg portions in an intermediate position in a width direction of the one end face of the base portion. The base portion has a pair of through holes along the one end face of the base portion, and on another end face side opposite to the one end face of the base portion, a joining region that joins to an external portion. The pair of through holes are specially positioned and have special wall surface configurations.