Triangular Diaphragm Rotary Loudspeaker Driver Eliminates Phase Cancellation
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Solution Overview
Problem
Conventional loudspeaker designs suffer from phase cancellation, material nonlinearities, and structural complexities, leading to sound distortions and inefficiencies due to the use of flexible surrounds and spiders, which complicate the reproduction of full-range frequencies without significant engineering and resource costs.
Innovation Solution
A rotary loudspeaker driver with a diaphragm having a triangular or higher-order cross-section, utilizing a magnetic homing mechanism and bearing support to ensure linear motion and eliminate phase cancellation, allowing for 360-degree sound radiation across all frequencies without the need for a loudspeaker box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional loudspeaker designs use flexible surrounds and spiders to support the diaphragm, then the diaphragm can be centered and returned to rest position, but this introduces material nonlinearities and sound distortions
Solution Approach 1:
The patent removes the flexible surround and spider components from the conventional loudspeaker design. Instead of using elastic materials to center and return the diaphragm, the invention uses a rigid frame with the diaphragm edge directly attached, eliminating the sources of material nonlinearities and sound distortions while maintaining the necessary centering function through geometric constraints
Solution Approach 2:
The patent replaces the mechanical elastic system (flexible surround and spider) with a rigid mechanical system. The diaphragm is supported by a rigid frame structure where the diaphragm edge is directly attached to the frame, using rigid geometric constraints instead of elastic deformation to achieve centering and return-to-rest functionality
2Reliability
If conventional designs use a loudspeaker box to control back radiation, then phase cancellation is prevented, but this increases device complexity, engineering costs, and causes diffraction of sound waves
Solution Approach 1:
The patent eliminates the loudspeaker box enclosure entirely. The design allows back radiation to exist without requiring a box to control phase cancellation, thereby removing the source of diffraction and reducing device complexity while maintaining phase control through the driver's geometric design
Solution Approach 2:
Instead of using a box to prevent phase cancellation by isolating back radiation, the patent inverts the approach by designing the driver itself to control phase relationships through its geometric configuration, allowing back radiation to coexist with front radiation without requiring an enclosing structure
3Device complexity
If the diaphragm edge is fixed to the frame as in planar magnetic speakers, then the structure is simplified, but the diaphragm moves non-linearly like a drum head rather than a piston
Solution Approach 1:
The patent applies different geometric properties to different parts of the diaphragm system. The diaphragm has a specific triangular or polygonal cross-section geometry that creates rigid triangular structures, providing localized geometric constraints that enforce piston-like motion while maintaining overall structural simplicity
Solution Approach 2:
The patent uses an asymmetric triangular or polygonal cross-section for the diaphragm rather than a symmetric circular or rectangular shape. This asymmetric geometry creates inherent rigid triangular structures that constrain the diaphragm to move in a piston-like manner, preventing drum-head-like nonlinear motion while keeping the structure simple
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
The solution enables a full-range driver with perfect horizontal polar response, reduced sound distortions, and minimized engineering complexities, achieving efficient sound reproduction with improved transient response and reduced material usage.
Implementation Method 1
The voice coil carries an electrical signal which creates a magnetic field. That field interacts with the magnetic field of a permanent magnet. The goal is to cause the voice coil and therefore the diaphragm to move in response to the frequency and amplitude of the electrical signal.
Implementation Method 2
A rotary loudspeaker driver with a diaphragm having a triangular or higher-order cross-section, utilizing a magnetic homing mechanism and bearing support to ensure linear motion
Data Source
AI summary
The design of a diaphragm for a rotary loudspeaker driver that eliminates phase cancellation and therefore eliminates the necessity of a box to acoustically isolate the front sound from the back. The key element of the design of the diaphragm is to use a cross section of at least three equal sides. This allows for the long sides of the diaphragm to create essentially positive pressure only as it rotates and creates a very rigid structure. Further by sizing the cross section to the width of the highest frequency to be produced you allow for a nearly perfect 360 degree radiation at all frequencies.