Sub Cone Design for Loudspeaker High-Frequency Response
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Solution Overview
Problem
Conventional loudspeakers with sub cones experience a deterioration in high-frequency response before reaching the upper limits of the audible range, leading to suboptimal sound quality.
Innovation Solution
The proposed loudspeaker design includes a sub cone with a slanted portion and an annular rim portion that extends linearly outward, increasing structural rigidity and reducing weight, thereby enhancing high-frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sub cone design is used, then the loudspeaker structure is simple, but the high-frequency response deteriorates before reaching the upper limits of the audible range
Solution Approach 1:
The sub cone is divided into two distinct functional portions: a slanted portion for sound emission and an annular rim portion for structural support. This segmentation allows each portion to be optimized independently - the slanted portion for acoustic performance and the rim portion for rigidity, thereby improving high-frequency response without excessive complexity
Solution Approach 2:
The annular rim portion extends in a direction orthogonal to the emission direction, adding a dimensional element that increases structural rigidity without blocking the sound path. This dimensional addition provides structural support while maintaining acoustic performance
2Strength
If the sub cone structure is made more rigid to improve high-frequency response, then the structural rigidity increases, but the weight of the sub cone increases
Solution Approach 1:
The annular rim portion is positioned specifically at the periphery of the sub cone where structural support is most needed for high-frequency response, while the central slanted portion remains optimized for sound emission with minimal weight. This localized reinforcement provides rigidity where required without adding unnecessary weight throughout the entire structure
Solution Approach 2:
The sub cone combines two distinct structural forms (slanted conical portion and annular rim portion) that work together to achieve optimal strength-to-weight ratio, with each portion contributing different mechanical properties to the overall 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
The improved sub cone design enhances the high-frequency response of the loudspeaker, maintaining favorable audio quality and preventing the gradual deterioration of high-frequency response within the audible range.
Implementation Method 1
a voice coil body including one end portion coupled to the main cone and another end portion disposed in a magnetic gap of the magnetic circuit
Data Source
AI summary
A sub cone for use in a loudspeaker includes a slanted portion that has an aperture area that increases toward an emission direction in which sound is emitted from the loudspeaker and a rim portion that is annular in shape and extends linearly outward from an edge of a distal end of the slanted portion in a direction orthogonal to the emission direction.