Lightweight Acoustic Enclosures Using Expanded Resin
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Solution Overview
Problem
Existing headrests with integrated speakers are often heavy due to the use of traditional materials like metal or injection-molded plastic, which can compromise safety and increase manufacturing costs.
Innovation Solution
The use of expanded resin as a lightweight rigid material for the acoustic enclosure, combined with a rigid plate and a second section molded over or attached to the plate, forms a housing that accommodates speakers while reducing weight and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional materials like metal or injection-molded plastic are used for the acoustic enclosure, then structural integrity is maintained, but weight increases
Solution Approach 1:
The acoustic enclosure combines expanded resin (lightweight foam material) with a rigid plate to create a composite structure. The expanded resin provides lightweight bulk while the rigid plate reinforces critical areas, achieving both weight reduction and structural integrity simultaneously
Solution Approach 2:
Instead of making the entire enclosure from heavy material, the rigid plate is strategically positioned only where structural support is needed, while the expanded resin fills other areas to provide lightweight bulk and acoustic isolation
2Ease of manufacture
If traditional materials like metal or injection-molded plastic are used for the acoustic enclosure, then structural integrity is maintained, but manufacturing costs increase
Solution Approach 1:
The combination of expanded resin and rigid plate creates a cost-effective composite structure where the inexpensive foam material provides bulk enclosure while the rigid plate adds structural strength, reducing overall manufacturing cost compared to using solid metal or thick injection-molded plastic
Solution Approach 2:
The rigid plate is prepared in advance and then the expanded resin is molded over it in a single operation, simplifying the manufacturing process and reducing assembly steps compared to traditional multi-component construction methods
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 solution significantly reduces the overall weight of the headrest while maintaining structural integrity and lowering production costs, enhancing safety and acoustic performance.
Implementation Method 1
The first section is constructed from expanded resin, and disposed in contact with the rigid plate. For example, the first section includes expanded resin over-molded on the rigid plate.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The technology described in this document can be embodied in an acoustic enclosure for a speaker system disposed in a portion of a vehicle seat. The acoustic enclosure includes a rigid plate configured to be attached to a frame, a first section, and a second section. The rigid plate configured to support a speaker disposed in part within the acoustic enclosure. The first section is constructed from expanded resin, and disposed in contact with the rigid plate. The second section is disposed in contact with the first section, between the second section and the rigid plate. The first and second section together define a housing of the acoustic enclosure that includes at least one cavity configured to accommodate a portion of the speaker.