Piezoelectric Vibration Element Support Structure for Impact Resistance
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Solution Overview
Problem
Existing electronic devices with piezoelectric vibration elements face challenges in impact resistance, as current support configurations can lead to damage from impacts due to contact between the vibration element and the container, or between the excitation electrode and the pillow portion, resulting in changes to the reference frequency and deterioration of temporal change characteristics.
Innovation Solution
The electronic device incorporates a container design with strategically placed projection portions that overlap the vibration element at specific intervals, supporting the free end portion at multiple locations while avoiding contact with the excitation electrode, thereby reducing damage and maintaining stable oscillation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pillow portion is disposed on the inner side of the vibration element to improve impact resistance, then impact resistance is improved, but the excitation electrode may contact the pillow portion causing damage and frequency changes
Solution Approach 1:
The patent transitions from a single-point support configuration to a distributed linear support configuration. The projection portions are arranged along the longitudinal direction of the vibration element, creating a multi-dimensional support structure that spreads the impact load across multiple contact points rather than concentrating it at one location, thereby preventing electrode contact while maintaining impact resistance
Solution Approach 2:
The support function is segmented into multiple discrete projection portions (first, second, third projection portions) distributed along the vibration element. Each projection portion provides independent support at specific locations, dividing the support task into multiple segments that collectively prevent both impact damage and electrode contact
2Reliability
If the pillow portion is disposed in an intermediate portion to avoid electrode contact, then electrode damage is prevented, but the free end portion may contact the container under impact
Solution Approach 1:
The support structure extends along the longitudinal dimension of the vibration element with projection portions positioned at multiple locations (first, second, and third projection portions). This linear distribution of support points creates a protective zone that prevents the free end from contacting the container during impact, while the intermediate positioning ensures electrode clearance is maintained
3Strength
If multiple projection portions are disposed along the vibration element, then impact resistance is improved and electrode contact is avoided, but device complexity increases
Solution Approach 1:
The multiple projection portions are merged into a single integrated container structure rather than being separate components. The projection portions form an unified support system that provides distributed protection while maintaining structural simplicity, avoiding the need for additional separate pillow components or complex assembly procedures
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 enhances impact resistance and maintains stable oscillation characteristics by effectively supporting the vibration element during impacts and preventing damage to the excitation electrode, ensuring the device operates reliably.
Implementation Method 1
The electronic device which uses a piezoelectric material, such as quartz crystal, is used in many fields as an electronic component, such as an oscillator, a vibrator, a resonator, and a filter.
Implementation Method 2
a first projection portion and a second projection portion which are disposed on the bottom plate... supporting the free end portion at multiple locations
Data Source
AI summary
An electronic device includes: a container including first and second projections disposed on a bottom plate; and a vibration element having an end on a third surface side of the vibration element placed in a container via a connector so that the first and second projections, and a first surface face each other with a void therebetween, and the first and second projection portions partially overlap the first surface on a fourth surface side of the vibration element, and are aligned along the direction intersecting the longitudinal direction of the vibration element. In addition, a relationship of L1>L2>L3 is satisfied when an interval between ends in the intersecting direction is L1, an interval between the first and second projections is L2, and an interval between ends in the intersecting direction of an electrode film is L3.