Diaphragm Edge Structure for Passive Radiator Vibration Control
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Solution Overview
Problem
In passive radiators, a large weight is required for sufficient bass reproduction, leading to unnecessary vibration and abnormal sound generation due to rolling.
Innovation Solution
An edge structure for the diaphragm with a recessed and projecting portion that changes shape gradually, inhibiting unnecessary vibration by providing uniform force distribution and preventing rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large weight is set in the passive radiator to achieve sufficient bass reproduction, then bass reproduction performance is improved, but unnecessary vibration and abnormal sound occur due to rolling
Solution Approach 1:
The edge of the passive radiator is designed with non-uniform thickness, creating local variations in structural properties. The edge includes a thin portion and a thick portion, where the thin portion has smaller cross-sectional area and the thick portion has larger cross-sectional area. This local quality variation allows different regions of the edge to serve different functions: the thin portion reduces rolling moment while the thick portion provides structural support, thereby suppressing unnecessary vibration and abnormal sound while maintaining bass reproduction performance
Solution Approach 2:
The edge structure employs asymmetric thickness distribution rather than uniform thickness. The edge extends in the width direction and has different thickness values at different positions, creating an asymmetric profile. This asymmetry is specifically designed to counteract the rolling motion caused by the weight, where the thinner portion reduces the rolling moment arm and the thicker portion provides structural reinforcement, effectively preventing abnormal sound generation
2Ease of manufacture
If the edge structure is made uniform to simplify manufacturing, then ease of manufacture is improved, but the ability to inhibit rolling and unnecessary vibration is reduced
Solution Approach 1:
Rather than using a uniform edge structure that would be easier to manufacture, the invention introduces local quality variations with specific thin and thick portions. This approach prioritizes vibration control performance over manufacturing simplicity, accepting that the edge requires differential thickness control during fabrication to achieve the desired suppression of rolling and abnormal sound
Data Source
AI summary
An edge surrounding a diaphragm has a recessed portion having a recess in one direction of vibration of the diaphragm, and a projecting portion having a projection in the one direction. At least part of the edge continuously has a first changing shape and a second changing shape. The first changing shape has a shape in which a cross-sectional shape of the recessed portion has a length gradually reduced, a cross-sectional shape of the projecting portion has a length gradually increased, and the recessed portion and the projecting portion change from one to the other, and the second changing shape has a shape in which a cross-sectional shape of the recessed portion has a length gradually increased, a cross-sectional shape of the projecting portion has a length gradually reduced, and the projecting portion and the recessed portion change from one to the other.