Piezoelectric Sheet Centering Disk Speaker High-Frequency Response
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Solution Overview
Problem
Conventional speaker devices face limitations in achieving good medium-high frequency performance due to high-frequency cutoff issues, making it difficult to generate acoustic waves with better quality and higher frequencies.
Innovation Solution
Incorporating a piezoelectric sheet into the centering disk of the speaker device, which is electrically connected and acts as an independent sound generation unit, supplementing the audio signals produced by the voice coil-diaphragm structure to enhance medium-high frequency effects and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voice coil-diaphragm structure is used, then the speaker device can generate sound, but the high-frequency response falls sharply causing high-frequency cutoff
Solution Approach 1:
The vibration system is segmented into two independent sound generation units: the voice coil-diaphragm structure and the piezoelectric sheet structure. Each unit operates independently to generate sound, with the piezoelectric sheet specifically addressing the high-frequency response deficiency of the conventional voice coil-diaphragm structure
Solution Approach 2:
Two different sound generation mechanisms (electromagnetic voice coil-diaphragm and piezoelectric) are merged into a single integrated vibration system. The piezoelectric sheet is integrated with the centering disk, allowing both units to work simultaneously to produce comprehensive audio output covering both low and high frequency ranges
2Reliability
If materials and process of conventional speaker devices are used, then manufacturing is straightforward, but it is difficult to increase the high frequency cut-off frequency
Solution Approach 1:
The invention changes the material parameter by introducing piezoelectric material into the centering disk. This material change enables the generation of high-frequency sound waves without fundamentally altering the conventional speaker manufacturing process, thus improving high frequency cut-off frequency while maintaining ease of manufacture
3Strength
If a reinforcement portion is provided at the central position of the centering disk, then structural strength is improved, but medium-high frequency performance is not significantly improved
Solution Approach 1:
The piezoelectric sheet integrated into the centering disk serves multiple functions simultaneously: it reinforces the structural strength of the centering disk (replacing the traditional reinforcement portion) and acts as an independent sound generation unit to produce medium-high frequency audio signals, thus achieving both structural and acoustic improvements
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 integration of the piezoelectric sheet improves the medium-high frequency response and overall acoustic performance of the speaker device by mixing its signals with those from the voice coil-diaphragm structure, effectively addressing the high-frequency cutoff limitations.
Implementation Method 1
A central position of the second fixing portion is provided with a piezoelectric sheet, the centering disk is provided with a first pad corresponding to the piezoelectric sheet, and the piezoelectric sheet is electrically connected to the first pad
Implementation Method 2
As current of the conductive voice coil in the magnetic field changes, the voice coil vibrates under Lorentz force, and thereby driving the diaphragm to vibrate to make a sound
Data Source
AI summary
A speaker device comprises a vibration system, a magnetic circuit system, and an auxiliary system for accommodating and fixing the magnetic circuit system and the vibration system. The vibration system comprises a diaphragm, a centering disk and a voice coil which are joined together. The centering disk comprises a first fixing portion, a second fixing portion provided within the first fixing portion, and a connecting arm connecting the first fixing portion and the second fixing portion. A central position of the second fixing portion is provided with a piezoelectric sheet, the centering disk is provided with a first pad corresponding to the piezoelectric sheet, and the piezoelectric sheet is electrically connected to the first pad. Since a signal emitted by the piezoelectric sheet is mixed with an audio signal emitted by the voice coil-diaphragm, the speaker device of the present invention has improved medium-high frequency effect and acoustic performance.