Coaxial Speaker Layout With Shared Magnet Gaps for Compact Audio
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Solution Overview
Problem
Existing coaxial speakers in portable mobile terminals face challenges with large size, unsatisfactory sound quality due to different speaker orientations, and high material costs from individual magnet systems.
Innovation Solution
A coaxial speaker design with a stacked magnet system where the second yoke includes a protrusion towards the second diaphragm, forming separate magnetic gaps for both coils, and the first and second vibration systems share a common magnet system, reducing size and enhancing magnet utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two different speakers are stacked together to provide sound signals in different frequency ranges, then sound quality is improved, but the size becomes large which is unfavorable for miniaturization
Solution Approach 1:
The patent combines two vibration systems (first and second vibration systems) into a single integrated structure where they share a common magnet system. The first vibration system includes a first diaphragm and first coil, while the second vibration system includes a second diaphragm and second coil. Both systems are arranged coaxially and share the same magnet assembly, thereby reducing the overall size while maintaining the capability to produce different frequency ranges.
Solution Approach 2:
The common magnet system serves dual functions by providing magnetic fields for both the first coil and second coil simultaneously. The magnet system includes magnets arranged to create magnetic gaps for both vibration systems, allowing one magnet assembly to support two separate voice coil actuators, thus achieving multi-functionality and size reduction.
2Adaptability or versatility
If two stacked speakers have different orientations of sound channels, then frequency coverage is improved, but loudness deficiency and unsatisfactory sound quality occur
Solution Approach 1:
The patent employs asymmetric arrangement of the two vibration systems within the coaxial structure. The first diaphragm and second diaphragm are positioned at different radial locations and orientations, allowing each to optimize its sound radiation pattern for its specific frequency range while maintaining coaxial alignment. This asymmetric positioning within the symmetric coaxial framework enables both frequency coverage and loudness optimization.
3Ease of operation
If two speakers have individual magnet systems, then independent control is improved, but material cost increases and magnet utilization cannot be maximized
Solution Approach 1:
The patent merges two separate magnet systems into a single common magnet system that serves both vibration systems. The magnet assembly includes magnets arranged to create distinct magnetic gaps for the first coil and second coil, allowing independent electrical control of each voice coil while sharing the same magnetic field source. This reduces material costs and maximizes magnet utilization efficiency.
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 design achieves a smaller form factor while improving sound quality and reducing material costs by optimizing magnet usage and vibration performance.
Implementation Method 1
a first coil configured to drive the first diaphragm; a second coil configured to drive the second diaphragm; the first coil is inserted into the first magnetic gap; the second coil is inserted into the second magnetic gap
Implementation Method 2
the first magnet and the second magnet has opposite magnetization directions parallel to a vibration direction
Data Source
AI summary
The present disclosure discloses a coaxial speaker including a frame, a magnet system, a first vibration system, and a second vibration system surrounded by and coaxially arranged with the first vibration system. The first vibration system includes a first diaphragm and a first coil. The second vibration system includes a second diaphragm and a second coil. The magnet system includes a first yoke, a first magnet and a second yoke, a second magnet and a third yoke are successively stacked on the first magnet. The second yoke includes a protrusion towards the second diaphragm, a first magnetic gap is formed between the first magnet and the first yoke, a second magnetic gap is formed between the second magnet and the protrusion, the first coil and the second coil are separately inserted into the first magnetic gap and the second magnetic gap.