Electrodynamic Transducer Internal Suspension Design
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Solution Overview
Problem
Dome-shaped loudspeaker transducers face issues with acoustic interference, reduced radiating surface, large radial size, and inadequate heat dissipation due to the peripheral suspension, which affects sensitivity and power handling, especially at high frequencies.
Innovation Solution
The use of an acoustically non-emissive material for the suspension, positioned inside the diaphragm, eliminates interference and increases the radiating surface to 100% of the diaphragm's diameter, along with an internal suspension and a waveguide for improved heat dissipation, and a coaxial loudspeaker system for comprehensive frequency coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peripheral suspension is used to hold the dome-shaped diaphragm, then the diaphragm can be supported and centered, but acoustic interference is created between the suspension and the diaphragm radiation
Solution Approach 1:
The suspension is extracted from the peripheral region and relocated to the central region of the diaphragm. By removing the suspension from the peripheral area where it caused acoustic interference, the harmful effect is eliminated while the suspension continues to perform its centering and support functions at the diaphragm's acoustic center.
Solution Approach 2:
The suspension acts as an intermediary element that is positioned at the acoustic center rather than peripherally. This intermediary placement allows it to fulfill its mechanical support function without interfering with the acoustic radiation path, as it is now positioned where it is least acoustically disruptive.
2Reliability
If peripheral suspension is used to fix the dome, then the diaphragm can be supported, but the radiating surface is reduced due to the non-radiating portion of the suspension
Solution Approach 1:
The suspension is extracted from the peripheral region and relocated to the central region. This extraction allows the entire peripheral area of the diaphragm to be used for radiation, maximizing the radiating surface area while the suspension continues to provide mechanical support at the acoustic center.
3Area of moving object
If large diameter diaphragm is used to increase radiating surface, then sound radiation is improved, but the radial bulk of the transducer increases
Solution Approach 1:
By extracting the suspension from the peripheral region and placing it at the acoustic center, the transducer achieves maximum radiating surface area without requiring increased radial dimensions. The suspension no longer occupies peripheral space that would otherwise be needed for additional radiation surface.
4Ease of operation
If exoskeleton is made of insulating material to allow wire connections, then electrical supply is enabled, but heat dissipation from the voice coil is impaired
Solution Approach 1:
The exoskeleton is designed with differentiated thermal properties in different regions: the central portion where the suspension attaches has thermal conductivity suitable for heat dissipation, while the peripheral portions can accommodate wire connections. This local differentiation allows both electrical supply and effective heat dissipation to coexist.
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 configuration enhances sensitivity by 1.4 dB, increases power handling, and reduces the transducer's radial size, while improving heat dissipation and maintaining high-frequency performance without external suspension-related drawbacks.
Implementation Method 1
The interaction between the electric current and the magnetic field produces a force known as the 'Laplace force,' which causes the voice coil to move, in turn moving the diaphragm, whose vibrations are the source of the acoustic radiation.
Implementation Method 2
The suspension's rebound function, which acts on the diaphragm like a spring, must be calibrated so that the resonant frequency is located at the beginning of the frequency range to be reproduced.
Implementation Method 3
the membrane's architecture is not well-suited to dissipating the heat generated by the Joule effect within the voice coil
Data Source
AI summary
The invention relates to an electrodynamic transducer (1) including: a magnetic circuit (2) that defines an air gap (15); a movable part (16) that includes a dome-shaped diaphragm (17) rigidly connected to a movable spool (18) that is placed down into the air gap (15); a holder (20) on which the movable part (16) is hung; and a hanging part (26) that ensures the connection between the movable part (16) and the holder (20). Within said transducer, the holder (20) extends at least partially into an inner space to the movable part (16), the hanging part (26) is attached, by an outer periphery, to an inner surface of the movable part (16), and the hanging part (26) is made of an acoustically non-emissive material.