Hard Dome Tweeter with T-Shaped Yoke for Flat SPL
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Solution Overview
Problem
Ordinary hard dome-type loudspeakers have an insufficient effective bandwidth range and a non-flat sound pressure level (SPL) curve, particularly below 15 KHz, which affects their performance in reproducing high frequencies.
Innovation Solution
A hard dome tweeter design featuring a vibrating diaphragm with a dome portion, a surround, a voice coil, and a magnetic circuit with a T-shaped yoke iron, sound-absorbing cotton, and a rear cavity to extend the high-frequency SPL curve and expand the effective bandwidth range to 600 Hz to 20 KHz while maintaining SPL curve flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional hard dome-type loudspeaker design is used, then the structure is simple and easy to manufacture, but the effective bandwidth range is insufficient and the SPL curve is not flat
Solution Approach 1:
The loudspeaker is divided into distinct functional modules: a dome tweeter unit with bandwidth 600Hz-20KHz and a separate mid-woofer unit, allowing each module to be optimized independently for its specific frequency range while maintaining overall system simplicity
Solution Approach 2:
The dome tweeter is nested within or integrated with the mid-woofer unit, with the tweeter positioned to face upward and the mid-woofer positioned below it, creating a compact multi-functional assembly that expands the overall effective bandwidth without significantly increasing structural complexity
2Ease of manufacture
If a conventional hard dome-type loudspeaker design is used, then the manufacturing process is simple, but the SPL curve flatness is insufficient
Solution Approach 1:
The patent modifies key parameters including the dome diameter (40-60mm), dome height (15-25mm), and introduces a specific geometric parameter λ (0.3-0.7) defining the curve shape, along with optimizing the magnetic circuit gap (0.5-1.5mm) to achieve flat SPL response across the extended bandwidth
3Adaptability or versatility
If the bandwidth is extended below 15 KHz, then the effective bandwidth range increases, but the SPL curve becomes uneven and the sound pressure level changes obviously
Solution Approach 1:
The patent introduces a dynamic geometric parameter λ (0.3-0.7) that defines the dome surface curvature, allowing the SPL response to be optimized across the extended frequency range by adjusting this parameter to balance the frequency response and maintain curve flatness
Solution Approach 2:
The patent specifies using titanium alloy or aluminum alloy for the dome, which are composite or alloy materials that provide the right balance of stiffness and flexibility to maintain stable SPL response across the extended bandwidth from 600Hz to 20KHz
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
Effectively lowers the treble resonance frequency, expands the effective bandwidth range, and ensures the flatness of the SPL curve within the new range, enhancing the loudspeaker's high-frequency response and overall sound reproduction.
Implementation Method 1
a current passes through a voice coil for generating a magnetic field, and the magnetic field of the voice coil interacts with a magnetic field of a magnetic circuit so as to drive a vibrating diaphragm to vibrate for producing a sound
Data Source
AI summary
This disclosure provides a dome tweeter, including a vibrating diaphragm, a surround, a voice coil, and a magnetic circuit. The vibrating diaphragm includes a dome portion. One end of the surround is connected to the dome portion of the vibrating diaphragm. The voice coil is located below the vibrating diaphragm. The magnetic circuit is located below the voice coil and includes a T-shaped yoke iron, the center of the T-shaped yoke iron is provided with a through hole, and the through hole faces a central position of the vibrating diaphragm.