Speaker Edge Rib Limits Diaphragm Stroke
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Solution Overview
Problem
In subwoofers and similar speakers, the large stroke in the direction opposite to sound emission can cause the voice coil bobbin, voice coil, or damper to collide with the permanent magnet or yoke, leading to potential damage and deterioration of sound quality.
Innovation Solution
A speaker design featuring a diaphragm supported by an annular elastic deformation member edge with protruded ribs between its inner and outer circumferential portions, which limits the stroke in the opposite direction to sound emission without restricting it, thereby preventing collisions and material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protruding portion is provided on the frame to limit the stroke in the direction opposite to sound emission, then the stroke is limited and collision is prevented, but the soft and thin edge is likely to be damaged by colliding with the hard protruding portion many times
Solution Approach 1:
The invention changes the material parameter of the stroke limitation structure from hard (frame material) to soft (elastic deformation member material), matching the edge's material properties to reduce impact damage while maintaining stroke limitation function
Solution Approach 2:
The invention makes the stroke limitation structure homogeneous with the edge by using the same or similar elastic deformation member material, ensuring compatible mechanical properties and reducing stress concentration at the collision interface
2Reliability
If the stroke in the direction opposite to sound emission is not limited, then the sound pressure and tone quality are improved, but the voice coil bobbin, voice coil or damper may collide with the permanent magnet or yoke, and the speaker may be broken
Solution Approach 1:
The invention introduces an intermediary elastic deformation member (the edge with rib) between the diaphragm and the frame that gradually limits the stroke, preventing direct collision between components while maintaining most of the vibration range for good sound quality
3Adaptability or versatility
If the edge is made of a soft and thin elastic deformation member for flexibility, then the diaphragm can vibrate freely in the sound emission direction, but the edge is more susceptible to damage from repeated collisions with hard structures
Solution Approach 1:
The invention changes the physical parameters (hardness, elasticity) of the stroke limitation structure to match the edge's soft and thin characteristics, allowing the edge to deform freely during normal operation while preventing damage during stroke limitation
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 solution effectively suppresses edge damage and maintains sound quality by allowing unrestricted sound emission while gradually limiting the stroke in the opposite direction, dispersing stress and reducing the risk of material fracture.
Implementation Method 1
a magnetic circuit that drives the diaphragm
Implementation Method 2
the edge and the damper have functions as suspensions for returning the diaphragm to a regular position
Data Source
AI summary
An edge has an inner circumferential portion connected to an outer circumferential portion of a diaphragm, and is made of an annular elastic deformation member. A frame is connected to an outer circumferential portion of the edge, and supports the diaphragm through the edge. A magnetic circuit displaces the diaphragm in a first direction that is a sound emission direction and in a second direction that is an opposite direction to the sound emission direction, and vibrates the diaphragm. In a region between the inner circumferential portion and outer circumferential portion of the edge, the edge includes a rib, which is protruded in the second direction, and limits a stroke of the diaphragm in the second direction.