Multi-Diaphragm Speaker with Shared Voice Coil
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Solution Overview
Problem
Conventional speakers face limitations in producing a wide range of frequencies due to the physical size of diaphragms, leading to inefficiencies in sound reproduction and increased size and weight, with prior art solutions either requiring multiple separate speakers or occupying excessive space.
Innovation Solution
A speaker design utilizing multiple diaphragms of varying sizes and shapes, coupled to a shared voice coil and bar magnets, allowing for efficient production of multiple frequency ranges while maintaining an ultra-thin form factor and improved directional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate speakers are used to cover different frequency ranges, then the frequency range coverage is improved, but the device complexity and size increase
Solution Approach 1:
The patent combines multiple diaphragms of different sizes onto a single voice coil assembly, merging multiple frequency-range-producing elements into one integrated unit. This allows the speaker to cover multiple frequency ranges (bass, mid-range, treble) without requiring separate speaker units, thereby reducing overall device complexity while maintaining broad frequency coverage
Solution Approach 2:
The single voice coil assembly serves multiple functions by driving diaphragms of different sizes simultaneously. The same electromagnetic actuator produces acoustic output across multiple frequency ranges, making the system multi-functional and eliminating the need for separate dedicated speakers for different frequency bands
2Adaptability or versatility
If multiple separate speakers are used to cover different frequency ranges, then the frequency range coverage is improved, but the weight increases
Solution Approach 1:
By merging multiple diaphragms onto a single voice coil assembly, the patent eliminates the weight of multiple separate speaker units. The combined structure shares common components (voice coil, magnetic assembly, housing), significantly reducing total weight while maintaining the ability to reproduce multiple frequency ranges
3Device complexity
If a single voice coil and magnetic structure are shared, then the device complexity is reduced, but the ability to independently control multiple diaphragms is limited
Solution Approach 1:
The system dynamically adapts to different frequency ranges by utilizing the natural resonant characteristics of diaphragms with different sizes. The single voice coil delivers a full-range signal, and each diaphragm naturally responds to the frequency range it is optimized for, creating effective independent control without requiring separate electromagnetic actuators
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 multi-diaphragm speaker achieves efficient sound reproduction across a broad frequency range with reduced size and weight, enhancing sound pressure levels and allowing for ultra-thin, lightweight designs suitable for compact applications.
Implementation Method 1
Each configuration of coil-shaped conductor is located between bar magnets and translates a received electric signal into the kinetic energy that vibrates one or more diaphragms
Implementation Method 2
the kinetic energy that vibrates one or more diaphragms, where each diaphragm, if sized differently, is better suited to produce sound within a different range of frequencies
Data Source
AI summary
Embodiments are disclosed of a speaker capable of producing multi-frequency-range sound using bar magnets, multiple diaphragms, and a shared planar voice coil. The planar voice coil is located between the bar magnets and translates a received electric signal into the kinetic energy that vibrates the diaphragms, thus reproducing multi-frequency range sound. In some embodiments, the speaker generates bi-directional sound.