Piezoelectric Element Positioning for Panel Vibration Uniformity
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Solution Overview
Problem
Traditional electronic devices with piezoelectric speakers experience uneven sound pressure distribution, leading to poor sound quality when used in direct contact with the ear and instability in haptic vibrations due to the piezoelectric element being positioned near the end of the panel, causing high vibration amplitude only at that point.
Innovation Solution
The piezoelectric element is positioned to maximize vibration amplitude at the center of the panel rather than near the end, with the distance between the element's side face and the housing interior being equal to or less than the element's width, allowing the entire panel to vibrate stably.
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 that point, then the vibration amplitude at the installed position becomes highest, but the sound pressure becomes low near the center and sound quality becomes unstable
Solution Approach 1:
The patent applies local quality by positioning the piezoelectric element specifically at the center of the panel in the longitudinal direction, creating a localized vibration source that generates sound pressure waves propagating uniformly in both directions. This central positioning ensures that the vibration energy is distributed evenly across the panel surface, providing stable sound quality and consistent tactile sensations regardless of where the panel is contacted.
2Strength
If the piezoelectric element is installed near the end of the panel, then the vibration amplitude becomes highest at the installed position, but the user must contact the device at a precise position to hear sound clearly
Solution Approach 1:
By positioning the piezoelectric element at the center of the panel, the patent creates a symmetric vibration pattern that radiates sound pressure waves equally in all directions along the panel. This ensures that users can clearly hear sound and receive tactile feedback regardless of where they contact the panel, eliminating the need for precise positioning and significantly improving ease of use.
3Strength
If the piezoelectric element is installed near the end of the panel, then the vibration amplitude is concentrated at one point, but the vibration amount varies significantly between end and center
Solution Approach 1:
The patent positions the piezoelectric element at the center of the panel to create a symmetric vibration source. This generates vibration waves that propagate uniformly in both directions along the panel, ensuring consistent vibration amplitude across the entire panel surface. The central positioning eliminates the significant vibration variation between end and center that occurs with end-mounted elements, providing stable and uniform tactile sensations.
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 ensures stable vibration across the entire panel, improving sound quality and tactile sensations by distributing sound pressure evenly, regardless of the user's contact position.
Implementation Method 1
piezoelectric element installed on the rear side of the panel... causing the panel to vibrate
Data Source
AI summary
In an embodiment, an electronic device 1 has a panel 20, a housing 10 that holds the panel 20, and a piezoelectric element 30 installed on the rear side of the panel 20, wherein the piezoelectric element 30 is installed at a position that allows for the vibration amplitude of the panel 20 to become the highest on the side closer to the center of the panel 20 in the longitudinal direction from the installed position of the piezoelectric element 30. The electronic device is capable of causing an entire panel to vibrate in a stable manner.