Distributed Transducer Suspension Cones for Compact Speaker Design
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Solution Overview
Problem
Conventional speaker designs with opposing drivers face challenges in minimizing external dimensions while maintaining high performance and linearity, particularly due to mechanical vibrations and the physical constraints that limit the placement of suspension components like the spider, leading to potential collisions and reduced sound quality.
Innovation Solution
The speaker device incorporates a Distributed Transducer Suspension Cones (DTSC) design with two opposite directed diaphragms, each driven by at least one magnetic driver, and a speaker damper system comprising coil brackets, diaphragm connection members, and damper frame connection members, allowing for a flexible and resilient suspension that prevents collisions and maintains linear motion by positioning the spider components in a way that they cross through the middle plane without intersecting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional opposing driver speaker designs are used, then the speaker can produce sound through diaphragm movement, but the external dimensions become large due to the need for separate suspension components like the spider
Solution Approach 1:
The patent combines the spider suspension component with the magnet structure into an integrated assembly. The spider is positioned to extend between the opposing diaphragms while the magnet structure provides both magnetic field generation and structural support for the suspension, eliminating the need for separate suspension component placement and reducing overall speaker volume.
Solution Approach 2:
The spider suspension is configured to extend in the axial direction between opposing diaphragms, utilizing the third dimension (depth) rather than requiring lateral space. This allows the suspension to function within the compact space created by back-to-back driver placement, resolving the conflict between compact dimensions and suspension component requirements.
2Reliability
If the spider suspension is placed between opposing diaphragms, then linear motion can be maintained, but mechanical vibrations cause collisions and reduced sound quality
Solution Approach 1:
The patent uses a second spider suspension on the opposing diaphragm to counterbalance mechanical vibrations and forces. When one diaphragm experiences outward force, the opposing diaphragm experiences inward force, and the second spider provides compensating support, reducing collisions and maintaining linear motion stability.
Solution Approach 2:
The integrated magnet structure serves as an intermediary between the voice coils and the spider suspensions, providing a rigid reference frame that stabilizes the spider positioning. This intermediary structure reduces mechanical vibrations by distributing forces through the magnet assembly rather than allowing direct transmission between opposing spiders.
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 design achieves a compact speaker form factor with improved linear response and sound quality by distributing the suspension units around the magnet structure, reducing mechanical vibrations, and ensuring that the diaphragms can move freely without colliding, thus enhancing the overall performance and reducing the footprint.
Implementation Method 1
each speaker driver has at least one magnetic driver for driving the two opposite directed diaphragms in operation
Implementation Method 2
a flexible and resilient suspension that prevents collisions and maintains linear motion by positioning the spider components
Data Source
AI summary
A speaker device (1) having a frame (2), two opposite directed diaphragms (3, 3′), and two speaker drivers, each having at least one magnetic driver (10, 10′) for driving the two opposite directed diaphragms (3, 3′) in operation. A speaker damper (5, 5′) is associated with each of the two opposite directed diaphragms (3, 3′), and has a coil bracket (4, 4′) arranged to be driven by the associated at least one magnetic driver (10, 10′), a diaphragm connection member (6, 6′) arranged to fixedly attach the diaphragm (3, 3′) to the speaker damper (5, 5′), and a damper frame connection member (8, 8′) arranged to fixate the speaker damper (5, 5′) to the frame (2). The speaker damper (5, 5′) further comprises a damper leg member (7, 7′) arranged between the diaphragm connection member (6, 6′) and the damper frame connection member (8, 8′).