Piezoelectric Array Elements for Digital Sound Reconstruction
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Solution Overview
Problem
Conventional analog speakers introduce noise and inefficiencies in digital signal conversion, limiting the quality and performance of sound reproduction systems.
Innovation Solution
A digital loudspeaker system utilizing a piezoelectric array of transducers, where each transducer comprises a flexible membrane actuated by a piezoelectric actuation element, allowing direct digital sound reconstruction without the need for a digital-to-analog converter, and featuring a buckled cantilever platform with bimorph actuators for thermal adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional analog speakers are used for digital signal conversion, then sound reproduction is achieved, but noise is introduced and conversion efficiency is reduced
Solution Approach 1:
The patent removes the digital-to-analog converter (DAC) from the audio reproduction chain, extracting the source of conversion noise and inefficiency. By using a piezoelectric array that directly responds to digital signals, the system eliminates the intermediate conversion stage that generates harmful noise and energy loss in conventional analog speakers.
Solution Approach 2:
The patent replaces the mechanical electrodynamic driver system with a piezoelectric actuation system. The piezoelectric elements convert electrical signals directly to mechanical motion without requiring analog conversion, substituting the traditional mechanical speaker system with a more efficient piezoelectric-based transducer array.
2Loss of energy
If a piezoelectric array is used for direct digital sound reconstruction, then noise and power consumption are reduced, but device complexity increases
Solution Approach 1:
The patent divides the audio reproduction function into multiple independent piezoelectric transducer elements arranged in an array. Each element can be individually controlled by digital signals, allowing direct digital sound reconstruction without requiring complex analog conversion circuitry, thereby reducing overall power consumption despite the increased number of elements.
Solution Approach 2:
The piezoelectric array elements serve multiple functions: they act as both the digital signal receivers and the acoustic transducers. This multi-functionality eliminates the need for separate DAC and speaker components, reducing power consumption while managing device complexity through functional integration.
3Volume of moving object
If piezoelectric actuation elements are made smaller for compact devices, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses thin-film piezoelectric layers deposited on flexible substrates, allowing the transducers to be made in compact sizes. The thin-film technology enables precise control of layer thickness and composition, managing manufacturing precision requirements while achieving small form factors suitable for portable devices.
Solution Approach 2:
The patent optimizes the physical and chemical parameters of the piezoelectric material, such as composition ratios and layer thicknesses, to achieve desired performance in compact dimensions. By carefully controlling these parameters during fabrication, the system maintains manufacturing feasibility while reducing transducer size for compact device integration.
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 solution reduces noise and power consumption, enabling high-resolution digital sound reconstruction with improved frequency response and linearity, suitable for compact, efficient, and directional sound reproduction in consumer electronics.
Implementation Method 1
Each transducer of the array of transducers may comprise a flexible membrane actuated by a piezoelectric actuation element
Implementation Method 2
The buckled cantilever platform may comprise bimorph actuators configured to adjust position of the plate in response to thermal heating
Data Source
AI summary
Various examples are provided for digital sound reconstruction using piezoelectric array elements. In one example, a digital loudspeaker includes a fixed frame and an array of transducers disposed on the fixed frame. Individual transducers of the array of transducers can include a flexible membrane disposed on a piezoelectric actuation element positioned over a corresponding opening that extends through the fixed frame. In another example, a method includes forming a flexible membrane structure on a substrate and backetching the substrate opposite the flexible membrane structure. The flexible membrane structure can be formed by disposing a first electrode layer on a substrate, disposing a piezoelectric layer on the first electrode layer and disposing a second electrode layer on the piezoelectric layer. A flexible membrane layer (e.g., polyimide) can be disposed on the second electrode layer.