Piezoelectric Speaker Vibration Width Enhancement
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Solution Overview
Problem
Piezoelectric speakers have limitations in vibration width, resulting in insufficient sound pressure levels, which affect the sound quality and characteristics, particularly in low-pitched sound bands.
Innovation Solution
A sound apparatus with a plate-shaped vibration member and multiple rectangular, rotation-symmetric vibration devices disposed on its surface, where the short side of one device is opposite to the long side of another, enhancing sound quality and sound pressure levels by increasing vibration width and adjusting displacement patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If piezoelectric devices are used in speakers, then the device structure is compact and simple, but the vibration width is limited resulting in insufficient sound pressure level
Solution Approach 1:
The patent divides the speaker system into multiple independent piezoelectric vibration devices (first, second, third, and fourth vibration devices) arranged in a specific pattern. Each device operates independently to contribute to the overall sound output, allowing the system to achieve higher sound pressure levels while maintaining the simplicity of piezoelectric technology.
Solution Approach 2:
The patent combines multiple piezoelectric vibration devices into a single speaker system where their vibrations are coordinated to produce enhanced sound pressure. The specific arrangement with short sides opposite to long sides creates a synergistic effect that increases overall vibration width and sound pressure level beyond what a single device could achieve.
2Stress or pressure
If multiple vibration devices are arranged to increase vibration width, then sound pressure level improves, but the device layout becomes more complex
Solution Approach 1:
The patent employs an asymmetric arrangement where the short side of one vibration device is positioned opposite to the long side of another vibration device. This asymmetric configuration optimizes the vibration width and sound pressure characteristics while maintaining a relatively simple four-device layout, avoiding the need for more complex multi-device arrangements.
3Ease of manufacture
If piezoelectric devices with limited vibration width are used, then manufacturing is simple, but sound quality in low-pitched bands is insufficient
Solution Approach 1:
The patent transitions from considering only the linear vibration width to utilizing two-dimensional arrangement of multiple vibration devices. By positioning four piezoelectric devices in a specific pattern with short sides opposite to long sides, the system achieves enhanced vibration width and improved low-pitched sound quality while maintaining the simplicity of piezoelectric device fabrication.
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 configuration enhances sound quality and sound pressure levels, particularly in low-pitched sound bands, by increasing the vibration width and adjusting displacement patterns, resulting in improved sound characteristics across a wide frequency range.
Implementation Method 1
Piezoelectric devices used to piezoelectric speakers are limited in vibration width
Data Source
AI summary
A sound apparatus includes a vibration member having a plate shape, and a plurality of vibration devices disposed at a surface of the vibration member to vibrate based on a driving signal input thereto, each of the plurality of vibration devices may have a rectangular shape and may be disposed to be rotation-symmetric, and a short side of one of the plurality of vibration devices may be opposite to a long side of another vibration device.