Piezoelectric Vibration Plate with Localized Rigidity for Sound Leakage Control
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Solution Overview
Problem
Existing electronic devices with piezoelectric vibration bodies of specific dimensions face challenges when the vibration body size exceeds approximately 0.8 cm by 3.2 cm, limiting their functionality and sound transmission effectiveness.
Innovation Solution
An electronic device design featuring a vibration plate with varying rigidity areas, where a piezoelectric element is joined to a panel, and the vibration plate is attached to a housing, allowing for larger vibration body sizes while generating both air and bone conduction sound through controlled vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the vibration body size is increased beyond 0.8 cm by 3.2 cm, then the sound transmission coverage and comfort are improved, but the device structure becomes complex and sound leakage increases
Solution Approach 1:
The vibration plate is designed with non-uniform rigidity distribution, where the first area (near the piezoelectric element) has lower rigidity to allow efficient vibration transmission, while the second area (peripheral region) has higher rigidity to suppress unwanted vibrations and sound leakage. This local quality differentiation enables the large vibration plate to maintain both effectiveness and structural simplicity.
2Area of moving object
If the vibration body size is increased beyond 0.8 cm by 3.2 cm, then the sound transmission coverage and comfort are improved, but sound leakage increases
Solution Approach 1:
The vibration plate incorporates regions of different rigidity: the first area with lower rigidity efficiently transmits vibrations to the user's body, while the second area with higher rigidity acts as a barrier to prevent sound leakage to the external environment, thus eliminating the harmful effect of increased vibration body size.
3Area of moving object
If a larger vibration plate is used to improve sound transmission, then the coverage area is increased, but the rigidity control becomes difficult
Solution Approach 1:
The vibration plate is designed with spatially varying rigidity properties, where the first area has lower rigidity for effective vibration transmission and the second area has higher rigidity for structural stability and sound leakage prevention. This differentiated rigidity control enables precise manipulation of vibration characteristics across the large plate area.
Solution Approach 2:
The vibration plate may be constructed using composite materials or material structures that allow different regions to exhibit different rigidity characteristics, enabling precise control of vibration properties across the entire plate while maintaining manufacturing feasibility.
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
Enables effective sound transmission and reduced sound leakage, improving usability and portability by allowing larger vibration plates without compromising sound quality or increasing device size, even when worn with headphones or earphones.
Implementation Method 1
a piezoelectric element; a vibration plate to which the piezoelectric element is joined for vibration
Data Source
AI summary
Provided is an electronic device including: a piezoelectric element; a vibration plate to which the piezoelectric element is joined for vibration; and a housing to which the vibration plate is joined. Vibration sound, which is transmitted by vibrating a part of a human body, is generated by the vibration plate. The vibration plate includes, in a plan view thereof, a first area including a joining portion with the piezoelectric element and a second area located further away from the joining portion than the first area is, and rigidity in a first area is lower than rigidity in the second area. With the above configuration, sound leakage or the like is reduced, and usability of the electronic device is improved.