Diffuser With Segmented Reflection Members For Nondirectional Sound Radiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional speakers often exhibit directional characteristics due to resonance between the diaphragm and diffuser, leading to non-uniform sound pressure frequency characteristics, especially in full-range speakers with broad frequency bands, making it difficult to achieve nondirectional sound radiation across all frequency ranges.
Innovation Solution
A diffuser design featuring an almost truncated cone-shaped first reflection member and a cone-shaped second reflection member, with a connection member to form first and second acoustic passages, is used to face the diaphragm, preventing resonance and ensuring nondirectional sound radiation by varying the cross-sectional area and separation distance along the acoustic passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single almost cone-shaped reflector is used to achieve nondirectional sound radiation, then directional characteristics are improved, but resonance occurs between the diaphragm and reflector causing large peaks in sound pressure frequency characteristics
Solution Approach 1:
The single reflector is divided into two separate reflection members (first and second reflection members) with different shapes. The first reflection member has an almost cone shape and the second has an almost truncated cone shape. This segmentation prevents resonance between the diaphragm and a single large reflector while maintaining nondirectional sound radiation characteristics across broad frequency bands.
2Ease of operation
If a reflector is provided for full-range speakers to achieve nondirectional characteristics, then sound radiation uniformity is improved, but it becomes difficult to handle both low frequency (long wavelength) and high frequency (short wavelength) sound waves effectively
Solution Approach 1:
Different regions of the diffuser structure are assigned different functions to handle different frequency ranges. The first reflection member (almost cone shape) and second reflection member (almost truncated cone shape) are positioned at different distances from the diaphragm, creating local acoustic environments optimized for different wavelength ranges. This allows effective handling of both low frequency (long wavelength) and high frequency (short wavelength) sound waves while maintaining nondirectional characteristics.
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 diffuser design effectively reduces large peaks in sound pressure frequency characteristics, achieving nondirectional sound radiation across both low and high frequency bands, and broadens directional characteristics in both horizontal and vertical directions.
Implementation Method 1
an almost truncated cone shaped first reflection member (11) which has an annular conical surface (15) which faces to the diaphragm... an almost cone shaped second reflection member (12) which is arranged close to the first reflection member (11) and has a conical surface (18)
Implementation Method 2
the diffuser (10) forms a first acoustic passage (21) that sound waves propagate and which radiates the sound waves to an outer diameter direction between the diaphragm (3) and the annular conical surface (15) of the first reflection member (11)
Data Source
AI summary
A diffuser which forms a first acoustic passage that sound waves propagate and which radiates the sound waves to an outer diameter direction between a diaphragm and an annular conical surface of a first reflection member, and forms a second acoustic passage the sound waves which pass the opening of the first reflection member propagate and which radiates the sound waves to an outer diameter direction between the annular concave surface of the first reflection member and a conical surface of a second reflection member.