Piezoelectric Panel Sound Transmission with Buffer Material
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Solution Overview
Problem
Existing electronic devices that transmit sound through panel vibration face issues with convenience and usability due to the need to hold a small vibrating body against the ear, and they do not adequately consider the problems associated with panel deformation.
Innovation Solution
An electronic device design that incorporates a piezoelectric element attached to a panel with a buffer material between the panel and the housing, allowing the panel to deform and transmit air-conducted and bone-conducted sound without protruding from the housing, using a buffer material that can be thinner towards the other end and adhered to either the panel or housing, and a housing with sheet metal inserts to reduce interference and enhance sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small vibrating body is attached to the outer surface of the housing, then bone-conducted sound can be transmitted to the user, but the device requires the user to hold the vibrating body against the ear which reduces convenience
Solution Approach 1:
The patent merges the vibrating body with the housing structure itself, making the housing serve dual purposes as both structural support and sound transmission medium. This eliminates the need for separate vibrating components that require manual positioning against the ear.
Solution Approach 2:
The housing is designed to perform multiple functions: providing structural support, enabling air-conducted sound transmission, and serving as the bone-conducted sound transmission path. This multi-functionality removes the need for dedicated vibrating components.
2Reliability
If the panel is made deformable to transmit vibration sound, then bone-conducted sound can be transmitted through panel deformation, but the panel may come into contact with the sheet metal in the housing causing interference
Solution Approach 1:
The patent introduces a buffer material as an intermediary layer between the deformable panel and the sheet metal housing. This buffer material prevents direct contact and interference while allowing the panel to deform freely for effective sound transmission.
Solution Approach 2:
The buffer material is pre-installed between the panel and housing to cushion and prevent harmful contact before any vibration or deformation occurs. This proactive measure eliminates interference issues.
3Stability of the object's composition
If the piezoelectric element is fixed rigidly to the housing, then the structure is stable, but the panel deformation is restricted reducing sound transmission quality
Solution Approach 1:
The patent applies different fixation methods to different regions: the piezoelectric element is fixed at specific locations to maintain structural stability, while the panel is left free to deform in other regions for effective sound transmission. This localized approach balances both requirements.
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 design allows for effective transmission of sound through panel vibration without the need to hold a small vibrating body against the ear, reducing sound leakage and improving usability by distributing vibration across the panel, and preventing damage to the piezoelectric element.
Implementation Method 1
an electronic device that vibrates a panel by applying a predetermined electric signal (audio signal) to a piezoelectric element
Implementation Method 2
causes the panel to generate air-conducted sound and vibration sound
Implementation Method 3
transmits air-conducted sound and bone-conducted sound to a user by transmitting the vibration of the panel to the user's body
Data Source
AI summary
The electronic device can effectively suppress a reduction in sound pressure and an increase in the distortion factor. The electronic device (1) includes a piezoelectric element (30), a panel (10) supporting the piezoelectric element (30), and a housing (60) holding the panel (10). The electronic device (1) causes the panel (10) to generate air-conducted sound and vibration sound that is transmitted by vibrating a part of a human body. A buffer material (90) is disposed between the panel (10) and the housing (60).