Loudspeaker Cone with Reverse Flange and Carbon Fiber Ring
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Solution Overview
Problem
Conventional loudspeakers are limited in producing high volumes of acoustic energy with low distortion due to the structure of the surround and stiffness of the cone, which adds mass and reduces efficiency and high-frequency response.
Innovation Solution
A loudspeaker design featuring a cone with a reverse angle flange and a reinforcing carbon fiber ring, combined with a narrow and tall surround, to enhance stiffness and air movement while maintaining low mass and minimizing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stiffening methods (struts, ribs, columns) are used to increase cone stiffness, then distortion is reduced, but mass increases which lowers efficiency and high frequency response
Solution Approach 1:
The cone is segmented into multiple layers with different material properties. The inner layer provides structural support while the outer layer is optimized for acoustic performance. This segmentation allows each layer to contribute differently to stiffness and mass characteristics, achieving high stiffness with minimized overall mass.
Solution Approach 2:
The cone uses composite material construction with an inner layer of rigid material (such as pressed fiberboard or particle board) and an outer layer of lighter material (such as vinyl-coated fabric or paper). This composite structure provides the necessary stiffness from the rigid inner layer while the lighter outer layer minimizes overall mass, resolving the contradiction between stiffness and weight.
2Weight of moving object
If cone mass is reduced to improve efficiency and high frequency response, then efficiency and frequency response improve, but mechanical strength and distortion resistance decrease
Solution Approach 1:
The cone is divided into functional segments: a rigid inner layer that bears mechanical loads and provides structural strength, and a lighter outer layer that contributes to acoustic radiation and minimizes mass. This segmentation allows the heavy load-bearing function to be separated from the light acoustic radiation function.
Solution Approach 2:
The composite construction combines a rigid inner layer (pressed fiberboard, particle board, or medium density fiberboard) that provides mechanical strength and distortion resistance, with a lighter outer layer (vinyl-coated fabric, paper, or other lightweight material) that reduces overall mass while maintaining acoustic performance.
3Productivity
If surround structure is modified to allow larger excursions for high output capacity, then air volume displacement increases, but distortion increases due to surround limitations
Solution Approach 1:
The surround is designed with dynamic characteristics that allow it to accommodate large excursions without excessive distortion. The surround material and geometry are optimized to provide compliance at large displacements while maintaining stability, enabling the cone to achieve high air volume displacement with acceptable distortion levels.
Solution Approach 2:
The surround parameters (material properties, cross-sectional geometry, mounting configuration) are optimized to provide the right balance of compliance and stability. By adjusting these parameters, the surround can allow larger excursions for high output capacity while maintaining sufficient stiffness to control distortion.
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 design allows for increased air volume displacement and improved efficiency with reduced distortion and extended frequency response within a specified frame size, enhancing the loudspeaker's performance and lifespan.
Implementation Method 1
A voice coil immersed in a magnetic field is attached to the neck of the cone
Implementation Method 2
The vibrating diaphragm causes motion of the surrounding air, thus producing acoustic energy
Implementation Method 3
a reinforcing ring bonded to a back side of the flange
Data Source
AI summary
The present invention is a loudspeaker. The loudspeaker includes a frame, a cone having an outer edge in a shape of a reverse angle flange, and a reinforcing ring bonded to a back side of the flange.