Piezoelectric Panel Asymmetric Bonding for Stable Vibration
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Solution Overview
Problem
Traditional electronic devices with piezoelectric elements suffer from uneven sound pressure distribution, leading to unstable sound quality and tactile sensations, especially when used in direct contact with the ear or away from it, due to concentrated sound pressures near the end of the panel and varying vibration amplitudes.
Innovation Solution
An electronic device design where a panel of roughly rectangular shape is bonded to a housing with at least one side not bonded, allowing the piezoelectric element to be installed near the non-bonded side, ensuring maximum vibration amplitude at the center for stable panel vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piezoelectric element is installed near the end of the panel to maximize vibration amplitude at the installation position, then the vibration amplitude at the installation position is improved, but the sound pressure distribution becomes uneven and sound quality becomes unstable
Solution Approach 1:
The panel is designed with an asymmetric bonding structure where only three sides are bonded to the housing while one side remains non-bonded. This asymmetric configuration creates a specific vibration mode where the vibration amplitude is maximized at the center of the panel rather than at the edges, resulting in uniform sound pressure distribution across the entire panel surface and stable sound quality regardless of device positioning.
2Strength
If the piezoelectric element is installed near the end of the panel, then the vibration amplitude at the installation position is maximized, but the tactile sensation becomes position-dependent and unstable
Solution Approach 1:
The asymmetric bonding configuration (three sides bonded, one side non-bonded) creates a vibration mode where the maximum amplitude occurs at the panel center. This ensures that haptic feedback is consistently experienced regardless of where the user contacts the panel, making tactile sensation stable and position-independent for haptic technology applications.
3Stability of the object's composition
If the entire panel surface is bonded to the housing, then structural stability is improved, but the vibration amplitude distribution becomes uneven
Solution Approach 1:
Instead of bonding all four sides symmetrically, the invention bonds only three sides asymmetrically, leaving one side non-bonded. This asymmetric bonding pattern allows the panel to vibrate freely in a mode that concentrates maximum amplitude at the center while maintaining adequate structural stability, achieving both structural integrity and uniform vibration distribution.
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 design achieves stable panel vibration across the entire surface, enhancing sound quality and tactile sensations by distributing sound pressure evenly, regardless of the device's position relative to the ear.
Implementation Method 1
piezoelectric element installed on the rear face side of the panel... causing the panel to vibrate
Data Source
AI summary
In an embodiments, an electronic device 1 has a panel 20 of roughly rectangular shape, a housing 10 that holds the panel 20, and a piezoelectric element 30 installed on the rear face side of the panel 20, wherein the panel 20 is bonded to the housing 10 with its edges supported on the housing 10, and it also has at least one side 21 not bonded to the housing 10 (non-bonded side). The electronic device is capable of causing an entire panel to vibrate in a stable manner.