Acoustic Module Assembly with Heat-Activated Film and Screen
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustic module manufacturing processes are complex, costly, and inefficient due to the need for multiple parts and components, particularly in the assembly of acoustic devices with waterproof membranes that can tear under hydrostatic pressure.
Innovation Solution
The use of heat-activated films (HAF) and screen layers with aligned apertures to form acoustic modules, where the substrate is heated to adhere the films and screen layers, allowing for efficient cutting and assembly of acoustic devices with a waterproof membrane that can move under pressure without tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure sensitive adhesive is used to couple acoustic modules to housing, then assembly is achieved, but compression boot and bracket are required increasing complexity and cost
Solution Approach 1:
The patent combines the adhesive layer with the screen element into a single integrated component. The screen element serves dual functions: protecting the acoustic port and providing the adhesive bonding surface, eliminating the need for separate compression boots and brackets.
Solution Approach 2:
The screen element is designed to perform multiple functions simultaneously: it acts as a protective mesh, an adhesive carrier, and a structural bonding element. This multi-functionality replaces what would traditionally require multiple separate components.
2Reliability
If waterproof membrane is bonded directly to screen element, then waterproofing is achieved, but membrane may tear under hydrostatic pressure
Solution Approach 1:
The patent creates a segmented structure with a gap between the waterproof membrane and the screen element. This gap allows the membrane to move independently under hydrostatic pressure without being constrained by the rigid screen element, preventing tearing while maintaining waterproofing.
Solution Approach 2:
The gap between the membrane and screen element creates a dynamic system where the membrane can flex and move in response to hydrostatic pressure changes. This dynamic capability allows the membrane to accommodate pressure variations without structural failure.
3Ease of manufacture
If can elements are individually stamped and fixed to substrate, then back volume is formed, but process is burdensome and inefficient
Solution Approach 1:
The patent merges the back volume formation process with the substrate manufacturing process. The back volume is formed as an integrated part of the substrate through molding, eliminating the need for separate stamping and assembly operations for can elements.
Solution Approach 2:
The back volume structure is pre-formed as part of the substrate during the substrate manufacturing process itself. This preliminary action eliminates subsequent assembly steps, significantly improving manufacturing efficiency.
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 method simplifies the assembly process, reduces costs by minimizing parts, and prevents waterproof membrane tears under hydrostatic pressure, enhancing the durability and functionality of acoustic modules.
Implementation Method 1
The substrate, layers of HAF, and the screen layer may be heated (which may also include compressing the layers) such that the first layer of HAF adheres to the substrate and the screen layer and the second layer of HAF adheres to the screen layer
Data Source
AI summary
In one embodiment, acoustic devices are formed on a substrate which is then placed on a first HAF layer, a screen, and a second HAF layer. The layers of HAF each have apertures aligned with acoustic ports of the devices. The substrate is heated such that the first layer of HAF adheres to the substrate and the screen and the second layer of HAF adheres to the screen. The substrate is cut to separate the devices into modules. In other embodiments, a waterproof membrane covering the acoustic port of an acoustic module may be bonded to a screen to form a gap such that it moves under pressure until restrained by the screen. In still other embodiments, back volume covers for acoustic devices are formed by stacking and heating a first HAF layer, a glass-reinforced epoxy laminate layer, a second HAF layer, and a top layer on a substrate.