Acoustic Generator Resin Layer Ultrahigh Frequency Sound Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional acoustic generators using piezoelectric elements face challenges in achieving high sound pressure at ultrahigh frequencies above 100 KHz due to large peak dips in frequency characteristics.
Innovation Solution
The acoustic generator employs a multilayer piezoelectric element configuration with a film, frame member, and resin layer to enhance sound pressure, where the piezoelectric elements are disposed on the film and embedded within the resin layer to suppress resonance and peak dips, utilizing a stacked structure of piezoelectric layers and internal electrodes for efficient vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a piezoelectric element is used to drive a vibration diaphragm with a predetermined gap, then the structure is simple and easy to manufacture, but the sound pressure is low at ultrahigh frequencies and large peak dips occur
Solution Approach 1:
The patent introduces a resin layer as an intermediary substance between the piezoelectric element and the vibration diaphragm. This resin layer replaces the traditional air gap and metal base structure, providing direct mechanical coupling that efficiently transmits high-frequency vibrations from the piezoelectric element to the vibration diaphragm, thereby achieving high sound pressure at ultrahigh frequencies while maintaining structural simplicity
Solution Approach 2:
The patent uses a composite structure consisting of a piezoelectric element, a resin layer, and a vibration diaphragm. The resin layer acts as a bonding material that couples the piezoelectric element to the vibration diaphragm, forming a composite acoustic generator that achieves both ease of manufacture and reliable high-frequency sound pressure output
2Ease of manufacture
If vibration is transmitted via metal base with predetermined gap, then the piezoelectric element is easily mounted, but sound pressure at ultrahigh frequencies remains low and peak dips occur
Solution Approach 1:
The resin layer serves as a mediator that directly bonds the piezoelectric element to the vibration diaphragm, eliminating the need for metal bases and predetermined gaps. This direct bonding approach simplifies the mounting process while simultaneously improving ultrahigh-frequency sound pressure transmission by removing the mechanical decoupling effect of air gaps
Solution Approach 2:
The patent extracts and removes the metal base structure and predetermined gap from the traditional acoustic generator design. By taking out these components, the invention eliminates the sources of vibration loss and resonance that cause peak dips, while the resin layer provides sufficient mechanical support and electrical insulation
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 configuration significantly increases sound pressure at ultrahigh frequencies while minimizing peak dips, achieving stable sound pressure characteristics up to 150 KHz with reduced frequency dependency.
Implementation Method 1
a piezoelectric element disposed on the film and inside the frame member
Data Source
AI summary
Provided is an acoustic generator which has a high sound pressure at ultrahigh frequencies and which can suppress occurrence of large peak dips. An acoustic generator includes a film, a frame member disposed on an outer peripheral edge of the film, a piezoelectric element disposed on the film and inside the frame member, and a resin layer filled inside the frame member so as to cover the piezoelectric element.