Piezoelectric Speaker Diaphragm Drive Mechanism
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Solution Overview
Problem
Conventional speakers with electromagnetic mechanisms are volumetric and energy-consuming, making it challenging to produce high sound quality in small, low-power speakers.
Innovation Solution
A speaker design utilizing a circuit board, peripheral wall, diaphragm, support members, and piezoelectric actuators to form various vibration chambers and driving mechanisms, enabling efficient sound production with different sound qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an electromagnetic mechanism is used in conventional speakers, then sound production capability is achieved, but the speaker becomes volumetric and energy-consuming
Solution Approach 1:
The patent replaces the electromagnetic mechanism with a piezoelectric actuator that directly drives the diaphragm through mechanical deformation. The piezoelectric actuator converts electrical signals directly into mechanical displacement without requiring electromagnetic coils, magnets, or complex mechanical assemblies, thereby reducing both energy consumption and device complexity
Solution Approach 2:
The patent changes the fundamental operating principle from electromagnetic force generation to piezoelectric deformation. By utilizing the piezoelectric effect where electrical voltage directly causes dimensional change in the actuator material, the system achieves sound production with lower energy consumption and simpler structure
2Volume of moving object
If conventional electromagnetic speakers are designed, then sound quality can be achieved, but the speaker size increases
Solution Approach 1:
The piezoelectric actuator provides direct mechanical coupling to the diaphragm with precise control over diaphragm displacement. This direct drive mechanism eliminates the need for large electromagnetic components while maintaining accurate sound reproduction through precise electrical control of actuator deformation
Solution Approach 2:
The patent utilizes the dimensional change capability of piezoelectric materials that expand or contract in response to electrical voltage. This allows for compact actuator design where the active element itself provides the driving motion, eliminating the need for separate mechanical transmission components and reducing overall speaker volume
3Volume of moving object
If piezoelectric actuators are used to drive diaphragm vibrations, then compact and low-power speaker design is achieved, but configuration flexibility is required for diverse sound outputs
Solution Approach 1:
The patent employs multiple piezoelectric actuators positioned at different locations on the diaphragm (central region, peripheral regions, different heights). This segmentation allows independent control of different diaphragm zones, enabling diverse sound production modes and flexible adaptation to various sound quality requirements while maintaining compact size
Solution Approach 2:
The piezoelectric actuator system is designed with multiple actuators that can be selectively activated or combined to produce different sound outputs. The same basic actuator structure serves multiple functions by varying the number, position, and activation pattern of actuators, providing configuration flexibility for diverse sound applications
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 speaker achieves high sound quality in a compact, low-power form by using piezoelectric actuators to drive diaphragm vibrations, offering flexible configurations for diverse sound outputs.
Implementation Method 1
The at least one piezoelectric actuator is located on a top of the at least one support member and electrically driven to cause a vibration of the diaphragm under applied electrical bias
Data Source
AI summary
A speaker includes a circuit board, a peripheral wall, a diaphragm, at least one support member and at least one piezoelectric actuator. The peripheral wall is located on a surface of the circuit board. The diaphragm has an outer boundary attached to the peripheral wall. The diaphragm, the peripheral wall and the circuit board collectively form a chamber. The at least one support member protrudes from the surface of the circuit board and is located within the chamber. The at least one piezoelectric actuator is located on a top of the at least one support member and electrically driven to cause a vibration of the diaphragm under applied electrical bias.