Piezoelectric Loudspeaker Driving Beams for Higher Audible SPL
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Solution Overview
Problem
Conventional piezoelectric loudspeakers, particularly micro-speakers, face insufficient driving capability, leading to lower Sound Pressure Level (SPL) within specific frequency ranges (20 Hz to 20 kHz), resulting in reduced sensitivity within the audible range.
Innovation Solution
The loudspeaker design includes a driving unit with multiple driving beams, each having a fixed region and an overhanging region, connected to a vibration unit through a coupled elastic structure, enhancing the driving capability by optimizing the length and thickness dimensions of the overhanging region to improve the output sound pressure level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional piezoelectric loudspeaker design is used, then device miniaturization and integration are achieved, but driving capability is insufficient resulting in lower Sound Pressure Level
Solution Approach 1:
The driving unit is divided into multiple independent driving beams (first driving beam, second driving beam, etc.), each capable of independent vibration and sound generation. This segmentation allows the system to achieve higher overall sound pressure level by combining the output of multiple beams while maintaining the miniaturized integrated structure of each individual beam.
2Power
If multiple driving beams are used to enhance driving capability, then Sound Pressure Level improves, but device complexity increases
Solution Approach 1:
Multiple driving beams are merged into a single integrated driving unit structure that shares common components such as the piezoelectric substrate, electrode patterns, and mounting structure. This merging approach allows the system to achieve enhanced sound pressure level through multiple vibration sources while avoiding the complexity of completely separate driving components.
3Productivity
If driving beams with optimized overhanging region dimensions are used, then deformation and transmission efficiency improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes specific geometric parameters of the overhanging region, including its length, width, and thickness dimensions, to achieve optimal deformation characteristics and transmission efficiency. By carefully selecting these parameter values within certain ranges, the system achieves high transmission efficiency while maintaining manufacturability through standard fabrication processes.
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 enhanced driving capability increases the output sound pressure level and sensitivity of the loudspeaker, particularly in the audible frequency range, by optimizing the deformation and transmission efficiency of the driving beams.
Implementation Method 1
The piezoelectric loudspeaker uses an inverse piezoelectric effect of piezoelectric materials to produce vibrations that emit sound waves outward
Implementation Method 2
optimizing the deformation and transmission efficiency of the driving beams
Data Source
AI summary
Disclosed is a loudspeaker, including: a casing, a driving unit, and a vibration unit. The driving unit is fixed to the casing and is drivingly connected with the vibration unit. The driving unit includes a plurality of driving beams, each of the plurality of driving beams includes a fixed region and an overhanging region. Each of the plurality of driving beams is connected with the casing through its fixed region, and each of the plurality of driving beams is connected with the vibration unit through its overhanging region.