Stepped Piezoelectric Assembly for Sound Directivity
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Solution Overview
Problem
Conventional piezoelectric assemblies in mobile terminals have a large vibration range and broad energy distribution, leading to poor directivity and inefficient space utilization due to uniform ceramic elements, which results in a large internal space occupation and reduced space efficiency.
Innovation Solution
A piezoelectric assembly with a stepped structure formed by stacking piezoelectric layers of varying sizes, where each layer is smaller than the previous one, creating a conical or trapezoidal shape, which concentrates deformation force at the center and reduces the occupied space, enhancing directivity and energy concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If piezoelectric ceramic elements with uniform overall thickness and same cross-sectional area are used, then the actuator has large vibration range and broad energy distribution area, but the signal output has poor directivity and the actuator occupies large internal space
Solution Approach 1:
The piezoelectric ceramic element is segmented into multiple piezoelectric layers with different cross-sectional areas, forming a stepped structure. This segmentation allows different regions to contribute differently to the vibration, concentrating energy at the center while reducing overall volume occupation.
Solution Approach 2:
The invention transitions from a uniform two-dimensional cross-section to a three-dimensional stepped structure with varying cross-sectional areas at different heights. This dimensional change enables simultaneous achievement of compact volume and centralized energy distribution for improved directivity.
2Productivity
If piezoelectric ceramic elements with uniform overall thickness and same cross-sectional area are used, then the actuator has large vibration range, but the space utilization rate of the mobile terminal is reduced
Solution Approach 1:
The stepped structure resembles a nested doll configuration where smaller piezoelectric layers are positioned above larger ones, creating a compact vertical arrangement. This nesting approach maximizes space utilization by reducing the horizontal footprint while maintaining the necessary vibration range through the stacked layers.
3Quantity of substance
If the overall size of piezoelectric ceramic elements is balanced, then the actuator occupies large internal space, but the energy distribution is broad
Solution Approach 1:
The stepped structure implements local quality by concentrating piezoelectric material at the center region with larger cross-sectional area at lower layers, while reducing material quantity at the periphery through smaller cross-sectional areas at upper layers. This creates localized energy concentration where needed while minimizing overall space occupation.
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 stepped structure design increases deformation force concentration at the center, reduces the occupied space, and improves the directivity of sound output, enhancing user experience and space utilization in mobile terminals.
Implementation Method 1
a piezoelectric assembly includes a vibrating member made of a piezoelectric material and a signal line connected to the vibrating member. The vibrating member includes two or more piezoelectric layers stacked in sequence
Data Source
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AI summary
A piezoelectric assembly and a fabrication method thereof, a screen component, and a mobile terminal are provided. The piezoelectric assembly includes a vibrating member (200) made of a piezoelectric material and a signal line (30) connected to the vibrating member. The vibrating member includes two or more piezoelectric layers (10) stacked in sequence. A size of at least one (12) of the piezoelectric layers is smaller than a size of any remaining one (11) of the piezoelectric layers to form a stepped structure.