Piezoelectric Micro Speaker Piston Diaphragm Amplification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional piezoelectric micro speakers face challenges in achieving sufficient voice output due to limited displacement of the vibrating membrane, which restricts sound generation efficiency.
Innovation Solution
A piezoelectric micro speaker design incorporating a piston diaphragm and a piston bar that amplifies the vibration of the vibrating membrane, allowing for increased displacement and sound output, along with a method of manufacturing involving a substrate with a cavity, a vibrating membrane, and a piezoelectric actuator that vibrates the membrane and diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional vibrating membrane structure is used, then the device structure remains simple, but the voice output and sound generation efficiency are insufficient
Solution Approach 1:
The diaphragm is divided into two functional parts: a vibrating membrane that vibrates in response to piezoelectric actuator movement, and a piston diaphragm that moves in piston motion. This segmentation allows each part to perform its specific function optimally, with the vibrating membrane converting electrical signals to mechanical vibration and the piston diaphragm amplifying sound output through its movement in the cavity.
Solution Approach 2:
A piston bar is introduced as an intermediary component connecting the vibrating membrane to the piston diaphragm. The piston bar transfers vibration from the vibrating membrane to the piston diaphragm, enabling the piston diaphragm to move in response to the piezoelectric actuator while maintaining structural separation between the vibrating membrane and piston diaphragm.
2Productivity
If the vibrating membrane displacement is increased to improve sound output, then the voice output increases, but the device complexity increases
Solution Approach 1:
The piston diaphragm utilizes the cavity structure already present in the substrate to achieve piston motion. The cavity serves dual purposes: as part of the acoustic chamber and as the space in which the piston diaphragm moves. This self-service approach allows the system to achieve enhanced sound output without requiring additional external components or complex structural modifications.
Solution Approach 2:
The piston bar is integrated with both the vibrating membrane and the piston diaphragm, merging multiple functions into a single component. The piston bar simultaneously serves as the connection element between the two diaphragms and as the transmission path for mechanical vibration, reducing the need for separate components and simplifying the overall structure.
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 enhances sound output by 81 times compared to traditional vibrating membrane displacement, enabling effective sound generation and adjustable resonance frequency through the piston motion of the diaphragm.
Implementation Method 1
a piezoelectric actuator disposed on the vibrating membrane, wherein a movement of the piezoelectric actuator vibrates the vibrating membrane
Implementation Method 2
vibration of the vibrating membrane due to the movement of the piezoelectric actuator moves the piston diaphragm
Implementation Method 3
adjustable resonance frequency through the piston motion of the diaphragm
Data Source
AI summary
Provided are a piezoelectric micro speaker having a piston diaphragm and a method of manufacturing the piezoelectric micro speaker. The piezoelectric micro speaker includes: a substrate having a cavity formed therein; a vibrating membrane that is disposed on the substrate and covers at least a center part of the cavity; a piezoelectric actuator disposed on the vibrating membrane so as to vibrate the vibrating membrane; and a piston diaphragm that is disposed in the cavity and performs piston motion by vibration of the vibrating membrane. When the vibrating membrane vibrates by the piezoelectric actuator, the piston diaphragm, which is connected to the vibrating membrane through a piston bar, performs a piston motion in the cavity.