Piezoelectric Speaker Vibration Plate Support for High-Frequency Sound
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric sounding bodies in earphones and headphones face challenges in achieving high-frequency sound quality due to sound pressure peaks in the high-frequency band, particularly from sibilant vocal sounds, which affect the electroacoustic conversion function.
Innovation Solution
An electroacoustic transducer design featuring a piezoelectric speaker with a vibration plate supported by a support member in multiple areas of its periphery, either through projections or an elastically deformable adhesive layer, allowing for increased vibration freedom and reduced resonance, thereby improving high-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the entire periphery of the vibration plate is firmly fixed to the support member, then structural stability is improved, but high-frequency vibration characteristics deteriorate due to restricted vibration freedom
Solution Approach 1:
The support member is divided into multiple discrete support portions (projections) rather than a continuous fixed structure. This segmentation allows different regions of the vibration plate periphery to have varying degrees of freedom, enabling high-frequency vibration while maintaining overall structural stability through distributed support points.
Solution Approach 2:
Different portions of the vibration plate periphery are supported with different characteristics through the multiple discrete support portions. This local differentiation allows certain areas to have more vibration freedom while others provide stability, optimizing both high-frequency response and structural integrity.
2Reliability
If the periphery of the vibration plate is supported in multiple areas, then high-frequency vibration freedom is improved, but manufacturing precision requirements increase due to complex support structure
Solution Approach 1:
The support member is integrated with the housing as a unified structure, combining the housing and support functions into a single component. This merging simplifies manufacturing by eliminating separate support structures and reducing assembly steps, while still providing the necessary multiple support portions for high-frequency vibration freedom.
3Reliability
If an elastically deformable adhesive layer is used between the periphery and support member, then vibration freedom is improved, but device complexity increases due to additional components
Solution Approach 1:
The elastically deformable adhesive layer acts as an intermediary between the vibration plate periphery and the rigid support member. This intermediate layer provides the necessary compliance to allow high-frequency vibration while maintaining the structural connection, effectively mediating between the conflicting requirements of firm support and vibration freedom.
Solution Approach 2:
The adhesive layer changes its mechanical parameters (elastic deformation) in response to vibration frequency, being more compliant at high frequencies to allow vibration freedom while maintaining structural support at lower frequencies. This parameter change enables the single component to fulfill multiple functional requirements.
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 effectively reduces sound pressure peaks in the high-frequency band, enhancing sound quality by optimizing the vibration mode and frequency characteristics, particularly in hybrid speakers where sibilant sounds are often amplified.
Implementation Method 1
a piezoelectric speaker (20) with a vibration plate (11) and a piezoelectric element (12) joined to the vibration plate (11)
Implementation Method 2
The adhesive layer (34, 44, 74) is constituted by an elastically deformable adhesive material
Data Source
AI summary
In an embodiment, an electroacoustic transducer has a piezoelectric speaker 20, housing, and support member 23. The piezoelectric speaker 20 has a vibration plate 11 with a periphery 111, and a piezoelectric element 12 joined to the vibration plate 11. The housing houses the piezoelectric speaker 20. The support member 23 is constituted by a part of the housing or by a separate member, and supports the vibration plate 11 in multiple areas along the periphery 111. The electroacoustic transducer can offer excellent high-frequency characteristics.