Flat Speaker Single Magnet Voice Coil Plates
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Solution Overview
Problem
Conventional speakers face limitations in size and complexity due to cylindrical magnets and cone-shaped diaphragms, which restrict their ability to produce a wide range of frequencies without distortion, and require multiple speakers for multi-frequency range reproduction, leading to increased size and weight.
Innovation Solution
A flat speaker design utilizing a single permanent magnet, a yoke, and one or more voice coil plates with a bobbin and coil arrangement between the magnet and yoke, allowing for efficient reproduction of a wide range of frequencies with reduced size and weight, and enabling multiple frequency ranges to be played simultaneously using a single magnetic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single permanent magnet is used to drive multiple voice coil plates, then device complexity is reduced and manufacturing cost decreases, but the challenge of controlling multiple frequency ranges simultaneously increases
Solution Approach 1:
The single permanent magnet is divided into multiple magnetic poles (N and S poles) arranged in a specific pattern, creating multiple independent magnetic fields. Each voice coil plate interacts with a specific magnetic pole pair, allowing independent control of different frequency ranges while using a single magnet structure.
Solution Approach 2:
The single permanent magnet serves multiple functions simultaneously: it generates multiple magnetic fields for different voice coil plates, provides magnetic flux paths through the yoke structure, and enables reproduction of multiple frequency ranges (woofer, mid-range, tweeter) within one unified magnetic system.
2Reliability
If conventional cone-shaped diaphragms are used, then low-frequency sound reproduction is achieved, but the speaker height increases and prevents thin speaker design
Solution Approach 1:
The speaker design transitions from a vertical cone-shaped structure to a horizontal flat structure. The magnetic field is generated horizontally between the permanent magnet and yoke, allowing the voice coil plates and diaphragms to be arranged in a planar configuration rather than requiring vertical space.
Solution Approach 2:
The diaphragms are designed as thin, flexible plates rather than rigid cone structures. These thin film diaphragms can vibrate effectively for low-frequency reproduction while maintaining a minimal thickness profile, enabling ultra-thin speaker design.
3Reliability
If multiple separate speakers are used for different frequency ranges, then wide frequency range reproduction is achieved, but size and weight increase
Solution Approach 1:
Multiple speaker functions (woofer, mid-range, tweeter) that would traditionally require separate speakers are merged into a single integrated structure. Multiple voice coil plates are stacked or arranged adjacent to each other within the same magnetic field gap, sharing common magnetic components (permanent magnet, yoke, frame) to reduce overall weight.
Solution Approach 2:
The voice coil plates and diaphragms are arranged in a nested or stacked configuration within the limited space of the magnetic gap. Smaller diaphragms for higher frequencies are positioned within the same structural envelope as larger diaphragms for lower frequencies, maximizing space utilization and minimizing overall speaker size and weight.
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 efficient reproduction of a wide range of frequencies with reduced size and weight, enabling ultra-light and ultra-thin speakers that can play multiple frequency ranges simultaneously, while minimizing manufacturing costs by using a single bar magnet.
Implementation Method 1
one or more voice coil plates located between the single permanent magnet and the yoke
Data Source
AI summary
Embodiments are disclosed of a flat speaker containing a single permanent magnet, a yoke opposite the single permanent magnet, and one or more voice coil plates located between the single permanent magnet and the yoke. The one or more voice coil plates each comprise a bobbin and a coil arranged on one or both sides of the bobbin.