Piezoelectric Vibration Device with Circular Electrodes for Resonance Control
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Solution Overview
Problem
Conventional vibration apparatuses using piezoelectric elements face challenges such as fragility, low reliability, and difficulty in controlling resonance frequency, especially when applied to flexible or thin structures, and they often produce weak vibrations due to external impacts and tetragonal shape limitations.
Innovation Solution
A vibration apparatus comprising a piezoelectric material with specific electrode configurations, including circular patterns and finger-type electrodes, which allows for simplified manufacturing and controlled resonance, enabling the generation of both ultrasound and audible sounds, and can be applied as an array type for large-area applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If piezoelectric elements are used to reduce thickness, then the thickness is reduced, but the reliability decreases due to fragility and susceptibility to external impacts
Solution Approach 1:
A protective structure is provided around the piezoelectric element to cushion and absorb external impacts before they reach the fragile piezoelectric material. This protective layer or housing prevents damage from shocks and mechanical stress, thereby maintaining reliability while preserving the thin-profile advantage of piezoelectric actuators.
2Device complexity
If tetragonal-shaped ultrasound piezoelectric devices are used, then the structure is simple, but the resonance frequency control becomes difficult and vibration strength is reduced
Solution Approach 1:
The piezoelectric element is designed with adjustable geometric parameters such as length, width, and thickness that can be tuned to control resonance frequency. By making the dimensions variable rather than fixed in a tetragonal shape, the device allows dynamic adjustment of resonant characteristics while maintaining manufacturing simplicity. The vibration strength is enhanced by optimizing these dimensional parameters to maximize mechanical output.
3Ease of manufacture
If conventional electrode configurations are used, then the manufacturing process is standard, but the sound quality and resonance control are insufficient
Solution Approach 1:
The electrode configuration is designed with specific patterns and distributions tailored to different regions of the piezoelectric element. By optimizing electrode placement, shape, and density in specific areas, the device achieves improved sound quality and resonance control. This localized optimization of electrode characteristics enhances acoustic performance while remaining compatible with standard manufacturing processes like screen printing or sputtering.
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 solution enhances sound quality and resonance control, providing a reliable and efficient vibration mechanism suitable for various applications including large-area displays and sensors, while minimizing the risk of damage from external impacts.
Implementation Method 1
a vibration portion including a piezoelectric material
Data Source
AI summary
A vibration apparatus includes a vibration device. The vibration device includes a vibration portion including a piezoelectric material, a first electrode portion at a first surface of the vibration portion and configured as a plurality of circular patterns, and a second electrode portion at a second surface different from the first surface of the vibration portion and configured as a single electrode, and the vibration device generates an ultrasound wave.