Coaxial Speaker with Reverse Phase Diaphragms for Sound Leakage Reduction
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Solution Overview
Problem
Coaxial speakers in existing technologies fail to effectively reduce sound leakage during operation, which hinders the realization of a private call function.
Innovation Solution
The coaxial speaker design incorporates a vibration system with three vibrating diaphragms and voice coils, where the first and third vibrating units reverse phase sound waves, counteracting sound waves in the far field to minimize leakage and enable a private call function, while the magnetic circuit system with a transmission cavity and magnetic gaps enhances sound production and reduces leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional coaxial speakers use separate vibration systems and magnetic circuit systems for high pitch and bass sound, then sound production capability is improved, but sound leakage cannot be effectively reduced
Solution Approach 1:
The vibration system is segmented into three independent vibrating diaphragms (first, second, and third vibrating diaphragms) that can vibrate independently. Each diaphragm is driven by its own voice coil and operates in a separate magnetic gap, allowing differentiated control of sound wave phases to reduce sound leakage while maintaining reliable private call function.
Solution Approach 2:
The first and third vibrating diaphragms are configured to generate reverse phase sound waves that preemptively counteract sound leakage before it propagates. By producing opposing sound waves in advance, the system neutralizes harmful sound leakage and enables effective private call function.
2Object-generated harmful factors
If three vibrating diaphragms and voice coils are used to generate reverse phase sound waves, then sound leakage is reduced and private call function is realized, but device complexity increases
Solution Approach 1:
The magnetic circuit system merges three magnetic gaps (first, second, and third magnetic gaps) into a unified structure that surrounds a common transmission cavity. This integrated design allows three independent vibrating units to operate simultaneously while sharing the same magnetic circuit framework, reducing overall structural complexity compared to three separate systems.
Solution Approach 2:
The magnetic circuit system employs a nested configuration where the first magnetic gap is surrounded by the second magnetic gap, which is in turn surrounded by the third magnetic gap. All three gaps share a common transmission cavity at their center, creating a compact nested structure that accommodates three vibrating diaphragms without requiring proportionally increased space or complexity.
3Object-generated harmful factors
If first and third vibrating diaphragms seal the transmission cavity, then sound wave counteraction is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The second vibrating diaphragm acts as an intermediary component positioned between the first and third vibrating diaphragms. It provides a reference alignment surface and structural support that facilitates precise positioning and sealing of the transmission cavity, reducing the direct alignment precision requirements between the first and third diaphragms.
Solution Approach 2:
The sealing function is distributed locally to specific regions where the first and third vibrating diaphragms contact the transmission cavity, rather than requiring uniform precision across entire diaphragm surfaces. This localized sealing approach reduces overall manufacturing precision requirements while maintaining effective sound wave counteraction.
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 design effectively reduces sound leakage and achieves a private call function by counteracting sound waves through reverse phase vibrations, improving sound quality and reducing interference.
Implementation Method 1
The voice coil includes a first voice coil, a second voice coil, and a third voice coil. The first voice coil is inserted into the first magnetic gap and drives the first vibrating diaphragm to vibrate. The second voice coil is inserted into the outer magnetic gap and drives the second vibrating diaphragm to vibrate. The third voice coil is inserted into the second magnetic gap and drives the third vibrating diaphragm to vibrate.
Implementation Method 2
The third vibrating diaphragm and the first vibrating diaphragm reversely vibrate. The first vibrating diaphragm and the third vibrating diaphragm seal the transmission cavity. The first vibrating diaphragm and the third vibrating diaphragm reversely vibrate, so that sound waves of the coaxial speaker are counteracted in a far field through the reverse phase sound waves.
Data Source
AI summary
A coaxial speaker includes a frame, a vibration system, and a magnetic circuit system. The vibration system includes a vibrating diaphragm and a voice coil. The magnetic circuit system includes a transmission cavity, an inner magnetic gap, and an outer magnetic gap. The inner magnetic gap includes a first magnetic gap and a second magnetic gap. The transmission cavity penetrates through the magnetic circuit system. The vibrating diaphragm includes a first vibrating diaphragm, a second vibrating diaphragm, and a third vibrating diaphragm. The third vibrating diaphragm and the first vibrating diaphragm reversely vibrate. The first vibrating diaphragm and the third vibrating diaphragm seal the transmission cavity. The voice coil includes a first voice coil, a second voice coil, and a third voice coil. The coaxial speaker effectively reduces sound leakage of a front receiver during working, and realizes a private call function.