Curved Piezoelectric Speaker Structure for Thin Stable Sound Output
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Solution Overview
Problem
Existing speakers face challenges in achieving compactness, good characteristics, and maintaining a stable shape, particularly with piezoelectric speakers that use soft polymer films and hybrid speakers that include dynamic components.
Innovation Solution
An electroacoustic transducer design featuring a curved sheet-like piezoelectric material with a reinforcing sheet, such as a nonwoven fabric, layered in a specific configuration and fixed within a frame structure to enhance stability and frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a piezoelectric polymer film is used as the film material, then the speaker can be made compact and thin, but the shape of the piezoelectric polymer film becomes unstable and can be easily disfigured by use operation
Solution Approach 1:
The patent applies composite materials by combining a piezoelectric polymer film with a reinforcing film to create a composite structure. The piezoelectric polymer film provides the necessary piezoelectric effect for sound generation, while the reinforcing film adds structural stability and prevents shape deformation during use, thus resolving the contradiction between compactness and shape stability.
Solution Approach 2:
The patent uses thin film structures for both the piezoelectric polymer film and the reinforcing film to maintain the compact and thin profile of the speaker. The reinforcing film is specifically designed as a thin yet structurally sound layer that provides shape stability without significantly increasing the overall thickness, thus maintaining compactness while improving stability.
2Reliability
If a dynamic speaker is combined with a piezoelectric speaker to ensure good reproduction frequency characteristics, then frequency characteristics are improved, but it becomes difficult to make a thin speaker
Solution Approach 1:
The patent changes the physical parameters of the piezoelectric speaker by adjusting the curvature radius of the piezoelectric polymer film and the thickness ratio between the piezoelectric polymer film and reinforcing film. These parameter changes enable the piezoelectric speaker to achieve good frequency characteristics without requiring a dynamic speaker, thus maintaining thin profile while improving frequency response.
3Volume of moving object
If the piezoelectric polymer film is made softer to achieve compactness, then the speaker can be made more flexible and thin, but the shape becomes even more unstable and prone to deformation
Solution Approach 1:
The patent uses composite materials where the piezoelectric polymer film (softer material) is combined with the reinforcing film (stiffer material). This composite structure allows the overall assembly to be thin and flexible while the reinforcing film provides the necessary strength and shape resistance, preventing deformation during use.
Solution Approach 2:
The patent applies local quality by having different regions of the film structure serve different functions. The piezoelectric polymer film region provides flexibility and piezoelectric effect, while the reinforcing film region provides structural support and shape stability. This local differentiation allows the speaker to be both thin and strong.
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 design achieves compactness, improved frequency characteristics, and maintains a stable shape, allowing for efficient sound reproduction across a wide frequency band without the need for dynamic speakers.
Implementation Method 1
a first sheet including a sheet-like piezoelectric material and having a curved shape
Data Source
AI summary
The present technology relates to an electroacoustic transducer and an electroacoustic transducer apparatus that are compact, have good characteristics, and can retain their stable shape.The electroacoustic transducer includes: a first sheet including a sheet-like piezoelectric material and having a curved shape; and a second sheet having substantially the same shape as the first sheet and placed on the first sheet in a layered manner. The present technology can be applied to an electroacoustic transducer.