Dual Opposing Driver Speaker Bellows Integration
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Solution Overview
Problem
Existing speaker devices with dual opposing drivers face challenges in minimizing size perpendicular to the excursion direction while directing air displacement towards a single surface, which is not efficiently addressed by conventional damper and porting methods.
Innovation Solution
The speaker device incorporates a vented frame element and a closed frame element positioned on either side of two membranes, with at least one bellows element connecting the membrane closest to the closed frame element to the closed frame element, creating a sealed compartment that directs all air displacement towards a single surface through the vented frame element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional damper and porting methods are used in dual opposing driver speakers, then the speaker can achieve basic air displacement, but the size perpendicular to the excursion direction cannot be minimized and the footprint is larger
Solution Approach 1:
The patent merges the damper function and port function into a single integrated bellows element. The bellows serves both as a damper to control air movement and as a port to direct air displacement, eliminating the need for separate damper and port structures. This integration reduces the overall footprint and minimizes the size perpendicular to the excursion direction while maintaining effective air displacement control.
Solution Approach 2:
The bellows element introduces a flexible dimensional aspect to the rigid speaker enclosure. By using the bellows's ability to expand and contract, the design efficiently manages air displacement in three-dimensional space rather than relying solely on conventional linear porting, thereby reducing the footprint while maintaining acoustic performance.
2Productivity
If air displacement is directed towards multiple surfaces, then air can be distributed more widely, but space efficiency is reduced and the structure becomes more complex
Solution Approach 1:
The patent extracts and concentrates all air displacement through a single bellows element that connects the membrane to the external environment. By taking out the air displacement path and routing it through one dedicated bellows structure, the design achieves high productivity in air displacement while maintaining compact space efficiency, avoiding the need for multiple air paths that would increase the overall volume.
3Volume of moving object
If a sealed compartment is created to direct air displacement, then space efficiency improves, but the structure becomes more complex with additional connection elements
Solution Approach 1:
The bellows element performs multiple functions simultaneously: it acts as a seal to create the closed compartment, serves as a damper to control air movement, functions as a port to direct air displacement, and provides structural connection between the membrane and enclosure. This multi-functionality reduces the need for additional separate components, thereby minimizing the footprint while avoiding excessive structural complexity.
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 enhances space efficiency, reduces the footprint, and allows for more effective air displacement, resulting in a lightweight, cost-effective, and high-efficiency loudspeaker unit.
Implementation Method 1
this allows to direct all air displacement towards a single surface, i.e. the air displacement of the two membranes is guided towards a single surface (in the vented frame element) through the at least one bellows element
Data Source
AI summary
A speaker device comprising two membranes facing each other, and two drive units arranged for driving the two membranes in opposite direction in operation. A vented frame element and a closed frame element are positioned outward on either side of the two membranes. At least one bellows element is connected on a first side to the membrane which is positioned closest to the closed frame element, and connected on a second side to the closed frame element.