Piezoelectric Vibration Plate Sound Leakage Reduction
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Solution Overview
Problem
Existing electronic devices that use piezoelectric elements to transmit sound through vibration suffer from sound leakage due to the vibration of the housing, which is not effectively addressed in current designs.
Innovation Solution
The electronic device employs a piezoelectric element that vibrates a panel, with a processed sound signal attenuating frequency components higher than a predetermined threshold to reduce sound leakage, allowing the panel to transmit air-conduction and human body vibration sound without protruding the vibration body from the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric element vibrates the housing to transmit sound, then sound transmission effectiveness is improved, but sound leakage from the housing increases
Solution Approach 1:
The patent applies parameter changes by processing the sound signal to attenuate frequency components above a predetermined threshold before applying it to the piezoelectric element. This modifies the frequency parameter of the vibration signal, reducing high-frequency vibrations that cause housing vibration and sound leakage while maintaining lower frequency components that effectively transmit sound through bone conduction.
2Reliability
If the vibration body protrudes from the housing to improve contact with the user, then sound transmission is improved, but the waterproof structure becomes more complex
Solution Approach 1:
The patent extracts the vibration function from a protruding vibration body and integrates it into the flat housing surface. The piezoelectric element is mounted on the housing surface and vibrates the housing directly, eliminating the need for a protruding vibration body while maintaining effective bone conduction sound transmission to the user's ear.
3Manufacturing precision
If high frequency components are included in the sound signal, then sound quality is improved, but vibration of the piezoelectric element and housing increases causing sound leakage
Solution Approach 1:
The patent modifies the frequency parameter of the sound signal by applying a filter that attenuates components above a predetermined threshold frequency. This parameter change reduces the high-frequency vibrations that cause excessive housing vibration and sound leakage, while preserving the essential frequency range for acceptable sound quality in bone conduction 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
This approach effectively reduces sound leakage while maintaining effective sound transmission, improving usability and reducing the risk of damage to the piezoelectric element, and simplifying the waterproof structure of the device.
Implementation Method 1
an electronic device that vibrates a panel by applying a predetermined electric signal (i.e. a sound reproduction signal) to a piezoelectric element
Data Source
AI summary
Provided is an electronic device that is capable of reducing sound leakage from a vibration plate vibrated by a piezoelectric element. An electronic device 1 of the present invention includes: a piezoelectric element 30; and a vibration plate 10 configured to be vibrated by the piezoelectric element 30. Vibration sound is transmitted by the vibration plate vibrating a part of a human body. The piezoelectric element 30 is vibrated using a processed sound signal in which at least a part of frequency components of a sound reproduction signal that are higher than a predetermined threshold value is cut or attenuated.