Vehicle Door Speaker Enclosure Volume Expansion
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Solution Overview
Problem
Conventional speaker systems in vehicle doors have limited sound pressure across the low sound range due to the restricted area volume of the cabinet, resulting in poor sound quality.
Innovation Solution
The speaker system is designed with an additional space between the outer and inner panels, utilizing a panel member mounted to the inner panel to form a larger enclosure, which includes through-holes for communication and sound absorption, enhancing sound pressure and reducing resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker is mounted to the inner panel with the enclosure defined only by the space between the outer panel and the inner panel, then the structure is simple and compact, but the area volume of the cabinet is limited which reduces sound pressure across the low sound range
Solution Approach 1:
The patent introduces a panel member that creates a new spatial dimension (first space) between the outer panel and inner panel, transforming the enclosure from a single-space configuration to a multi-space configuration. This dimensional expansion increases the cabinet volume without significantly complicating the overall door structure, as the panel member integrates with existing door components.
Solution Approach 2:
The patent implements nesting by placing the first space (between outer panel and panel member) and second space (between panel member and inner panel) within the existing door structure. The speaker enclosure is nested within the door assembly, utilizing the through-hole in the inner panel to communicate between spaces while maintaining a compact integrated structure.
2Ease of manufacture
If the area volume of the cabinet is limited to the space between the outer panel and the inner panel, then the assembly is compact and easy to manufacture, but the lowest resonance frequency increases which decreases sound pressure across the low sound range
Solution Approach 1:
The panel member serves multiple functions: it creates the expanded enclosure volume, acts as a structural support element, and provides mounting surfaces for the speaker. The through-hole in the inner panel simultaneously serves as a communication passage between spaces and as part of the enclosure definition. This multi-functionality maintains ease of manufacture while achieving improved acoustic performance.
3Volume of moving object
If the through-hole in the inner panel is covered by a soundproof member, then sound leakage is reduced, but the area volume of the cabinet remains limited and low sound range performance is not improved
Solution Approach 1:
The patent merges the first space and second space into a unified speaker enclosure by using the through-hole as a communication passage between them. Instead of covering the through-hole with a soundproof member that would separate the spaces, the design combines both spaces into one functional enclosure volume, increasing the effective cabinet volume while managing sound leakage through the integrated structure.
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 configuration increases sound pressure across the low sound range and improves sound quality by expanding the enclosure volume and minimizing resonance issues.
Implementation Method 1
the inner panel has a through hole configured to communicate the first space with the second space
Implementation Method 2
a lowest resonance frequency of a speaker system is determined by an area volume of a cabinet in which a speaker is housed
Data Source
AI summary
A speaker system includes an outer panel of a vehicle door of a vehicle having a compartment; a panel member that constitutes a part of the vehicle door, the panel member being closer to the compartment than is the outer panel; an inner panel of the vehicle door, the inner panel residing between the outer panel and the panel member to form a first space and a second space, the first space being defined between the panel member and the inner panel, and the second space being defined between the outer panel and the inner panel, wherein the inner panel has a through hole that communicates the first space with the second space; and a speaker mounted to the panel member; wherein: the panel member is mounted to the inner panel; and the panel member together with at least the outer panel constitutes an enclosure for the speaker.