Speaker Rear-Cavity Sealing With Injection-Molded Silicone
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Solution Overview
Problem
Existing sound-generating devices in mobile devices suffer from poor acoustic performance due to reduced rear cavities and poor water resistance caused by plastic connections, leading to inadequate sealing and waterproofing.
Innovation Solution
A sound-generating device with an annular silicone rubber member injection-molded into a metal housing, sealing the peripheral side of the sound-generating unit and forming a rear cavity, combined with a seal plate and additional silicone rubber member for enhanced waterproofing and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sound-generating unit is fixedly connected to the housing with plastic, then the connection is stable, but the rear cavity is reduced resulting in poor acoustic performance
Solution Approach 1:
The patent uses a flexible adhesive layer instead of rigid plastic to connect the sound-generating unit to the housing. This flexible connection method maintains stable attachment while occupying minimal space, thereby preserving the rear cavity volume needed for acoustic performance.
2Ease of manufacture
If the upper cover and housing are fixedly connected with foam, then the connection is simple, but the sealing performance is poor resulting in poor water resistance
Solution Approach 1:
The patent employs a composite sealing structure combining a sealing ring made of flexible material with an adhesive layer. This composite approach maintains manufacturing simplicity while achieving reliable water resistance through the synergistic effect of the sealing ring's physical barrier and the adhesive's bonding capability.
3Volume of moving object
If the rear cavity is reduced for compact design, then the device size is smaller, but the acoustic performance deteriorates
Solution Approach 1:
The patent applies local quality optimization by using space-efficient connection methods (flexible adhesive layer) only where needed for mounting, while preserving the rear cavity volume in the acoustic chamber area. This localized approach allows compact overall design without sacrificing acoustic 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 provides improved waterproof sealing and enlarged rear cavity, enhancing acoustic performance while maintaining structural stability and ease of assembly.
Implementation Method 1
the first silicone rubber member seals and surrounds a peripheral side of the sound-generating unit, and the first silicone rubber member abuts against inner sides of both the upper cover and the housing to seal the rear cavity
Implementation Method 2
the first silicone rubber member abuts against inner sides of both the upper cover and the housing to seal the rear cavity
Data Source
AI summary
Provided are a sound-generating device and an electronic terminal. The sound-generating device includes an annular housing, a lower cover fixed to a side of the housing, an upper cover extending inward from the other side of the housing and enclosing to form a sound-generating hole, and a sound-generating unit supported on and fixed to a side of the upper cover close to the lower cover and located in the housing. The sound-generating unit, the housing, and the lower cover jointly enclose a rear cavity, and a sound-generating side of the sound-generating unit directly faces the sound-generating hole. The sound-generating device further comprises an annular first silicone rubber member injection-molded into the housing, the first silicone rubber member seals and surrounds a peripheral side of the sound-generating unit, and the first silicone rubber member abuts against inner sides of both the upper cover and the housing to seal the rear cavity.