Long Flat Speaker Diaphragm Edge Support for Break-up Resonance
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Solution Overview
Problem
Conventional slim speakers often experience break-up resonance along the longer-side direction, leading to deteriorated sound quality due to their design, which affects frequency characteristics and sound pressure levels.
Innovation Solution
A speaker design featuring a long flat diaphragm with roll edges only at the ends in the longer-side direction, a voice coil bobbin of substantial square pillar shape, and a magnetic circuit with a magnetic gap filled with adsorptive fluid to prevent fluid dispersion and enhance sound blocking, while maintaining a slim and long structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the speaker is designed with a long flat diaphragm driven at the center, then the speaker can achieve a slim and long shape, but break-up resonance occurs along the longer-side direction deteriorating sound quality
Solution Approach 1:
The invention extracts the edge support structure from the shorter-side directions while maintaining it only at the ends in the longer-side direction. This selective removal eliminates the cause of break-up resonance (edges at shorter sides) while preserving the necessary support for diaphragm operation, thereby resolving the contradiction between slim shape and sound quality
Solution Approach 2:
The invention segments the edge support function by applying it differently to different directions: edges are provided at both ends in the longer-side direction but omitted at the ends in the shorter-side direction. This directional segmentation allows the diaphragm to vibrate freely in the shorter-side direction, preventing break-up resonance while maintaining structural integrity in the longer-side direction
2Reliability
If edges are provided at all ends of the diaphragm, then the diaphragm is well supported, but the speaker width increases and break-up resonance occurs
Solution Approach 1:
The invention extracts unnecessary edge supports from the shorter-side directions while retaining essential edge supports at the ends in the longer-side direction. This selective extraction reduces speaker width and eliminates break-up resonance causes while maintaining adequate diaphragm support for reliable operation
Solution Approach 2:
The invention applies different edge support configurations to different locations: full edge support at the ends in the longer-side direction versus no edge support at the ends in the shorter-side direction. This local differentiation optimizes both support quality and width reduction, resolving the contradiction between diaphragm support and speaker width
3Object-affected harmful factors
If magnetic fluid is used in the magnetic gap, then sound blocking is improved, but magnetic fluid dispersion occurs reducing stability
Solution Approach 1:
The invention introduces a porous layer as an intermediary substance between the magnetic fluid and the surrounding environment. This porous layer acts as a retaining medium that prevents magnetic fluid dispersion while allowing the magnetic fluid to perform its sound blocking function, thereby resolving the contradiction between sound blocking effectiveness and fluid stability
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 prevents break-up resonance, achieves smooth frequency characteristics, and provides good sound quality by controlling resonance modes and maintaining stability of the magnetic fluid, resulting in improved sound reproduction.
Implementation Method 1
a magnetic fluid that is liquid having property of being adsorbed by magnetic force, the magnetic fluid filling the magnetic gap internal space, wherein the magnetic fluid blocks transmission of sound
Implementation Method 2
The current flowing in the voice coil 806 and a magnetic field around the voice coil 806 allows the voice coil bobbin 805 to execute pistonic motion
Data Source
AI summary
A speaker includes a diaphragm 11, edges 12, at least one voice coil bobbin 14, a voice coil 15, and a magnetic circuit 21. The diaphragm 11 is a long flat plate. The edges 12 at ends of the diaphragm 11 in a longer-side direction support the diaphragm 11 to vibrate. The voice coil bobbin 14 has a substantially square pillar shape with a height more than twice as vibrational amplitude of the diaphragm 11, includes an opening having a periphery connected directly to the diaphragm 11, and supports the diaphragm 11 to transmit vibration to it. The voice coil 15 is wound around an outer periphery of the voice coil bobbin 14 substantially at center in a height direction. The magnetic circuit 12 drives the voice coil 15. The long speaker is unlikely to cause breakeup resonance, and has smooth frequency characteristics to offer good sound quality.