Auxiliary Material with Differential Adhesion for Speaker Vibration Damping
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Solution Overview
Problem
The open rear acoustic cavity design in speaker boxes of mobile devices causes vibrations in the rear housing, leading to a numb feeling in the user's hands, especially when playing low-frequency sounds, which negatively impacts user experience.
Innovation Solution
An electronic device design that incorporates an auxiliary material with a weak-adhesion surface bonded to a functional component and a strong-adhesion surface bonded to the rear housing, creating a mounting cavity that connects the rear acoustic cavity of the speaker box to the mounting cavity, thereby suppressing vibrations of the rear housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the rear acoustic cavity of the speaker box is connected to the inner cavity of the mobile phone to achieve high volume and stereo sound effects, then the speaker effect is improved, but the rear housing vibrates and causes numb feeling in user's hands
Solution Approach 1:
A damping sheet is introduced as an intermediary material between the rear housing and the functional component (battery). This damping sheet absorbs and dissipates the vibrations generated by the speaker box, preventing them from transmitting to the rear housing while maintaining the acoustic cavity connection for improved speaker effect.
Solution Approach 2:
The damping sheet is made of composite material with specific damping properties. This composite material structure enables the sheet to effectively absorb vibrations across different frequency ranges, particularly the low-frequency vibrations that cause the numb feeling, while allowing the acoustic cavity to function properly.
2Object-affected harmful factors
If the damping sheet is bonded to both the rear housing and the functional component, then the vibration suppression is improved, but the maintenance and component reuse becomes difficult
Solution Approach 1:
The damping sheet has different adhesion properties at its different surfaces. One surface has strong adhesion to effectively bond with the rear housing for vibration suppression, while the other surface has weak adhesion to allow easy detachment from the functional component during maintenance, enabling component reuse.
Solution Approach 2:
The damping sheet is designed as a separate, independent component with asymmetric adhesion characteristics. This segmentation allows the damping sheet to be easily removed from the functional component while remaining bonded to the rear housing, facilitating maintenance without compromising vibration suppression performance.
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 solution effectively suppresses the vibration of the rear housing, enhancing user experience by reducing the numb feeling associated with low-frequency sound playback, while also facilitating easy maintenance and reuse of components.
Implementation Method 1
the auxiliary material has a weak-adhesion surface and a strong-adhesion surface that are opposite to each other, adhesive force of the weak-adhesion surface is less than adhesive force of the strong-adhesion surface
Data Source
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AI summary
An auxiliary material used in an electronic device is provided. The auxiliary material includes an adhesive layer, a foam layer, and a double-sided tape layer that are sequentially stacked, the auxiliary material is used to be bonded between a rear housing of the electronic device and a functional component of the electronic device, the adhesive layer is used to be bonded to the functional component, the double-sided tape layer is used to be bonded to the rear housing, and adhesive force of a surface on which the adhesive layer is bonded to the functional component is less than adhesive force of the double-sided tape layer. An electronic device is provided. A speaker box of the electronic device has a design of an open rear acoustic cavity. The electronic device further includes a rear housing, a functional component, and an auxiliary material. The auxiliary material has a weak-adhesion surface and a strong-adhesion surface that are opposite to each other, adhesive force of the weak-adhesion surface is less than adhesive force of the strong-adhesion surface, the weak-adhesion surface is bonded to the functional component, and the strong-adhesion surface is bonded to the rear housing. A rear housing assembly is provided, and includes a rear housing and an auxiliary material bonded to an inner surface of the rear housing.