Electroacoustic Transducer Tubular Coupling Durability
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Solution Overview
Problem
Conventional electroacoustic transducers, such as speakers and microphones, face challenges in achieving uniform directivity across a wide audible frequency range and have weak constructions that lead to unreliable vibration transmission and low durability at the coupled portions of the diaphragm and voice coil.
Innovation Solution
The design includes a diaphragm with a pair of longitudinal split tubular surfaces arranged side by side, a valley between them, and a tubular portion that couples the diaphragm and voice coil, allowing for firm fixation and reliable vibration transmission, along with a cap member to prevent dust ingress, enhancing durability and directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coupled portion of the membranes extends straight to join the voice coil, then the directivity at middle and high frequencies is improved, but the construction becomes weak and durability is reduced
Solution Approach 1:
The patent applies curvature to the coupled portion by providing a tubular portion that extends in the depth direction of the valley, curving along the voice coil rather than extending straight. This curved configuration strengthens the coupling between the diaphragm and voice coil, improving durability while maintaining the longitudinal split tubular structure for good directivity.
2Strength
If a bent portion of wing-pair membrane is mounted in V-shaped cuts of voice coil, then the strength of coupled portions is increased, but the increase is not sufficient for reliable vibration transmission
Solution Approach 1:
The patent transitions from a two-dimensional planar coupling (mounting membrane in V-shaped cuts) to a three-dimensional tubular structure that extends in the depth direction. This dimensional change allows the tubular portion to wrap around and firmly fix the voice coil to the diaphragm throughout the entire length, providing sufficient strength for reliable vibration transmission.
Solution Approach 2:
The tubular portion acts as an intermediary structure between the diaphragm and voice coil, providing a dedicated coupling mechanism that firmly fixes both components throughout their entire length. This intermediary tubular structure enables reliable vibration transmission that neither the membrane alone nor the voice coil alone can achieve.
3Reliability
If end portions of voice coil and cone-type membrane are joined in entire perimeter, then vibration transmission is good, but directivity is not uniform across frequency ranges
Solution Approach 1:
The patent segments the diaphragm into a longitudinal split tubular structure with two separate tubular surfaces, allowing each surface to radiate sound independently. This segmentation provides wide directivity at middle and high frequencies while the tubular portion maintains strong coupling for good vibration transmission.
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
This configuration results in wide directivity for both speakers and microphones, with improved durability and reduced vibration loss, enabling reliable sound reproduction and pickup across a full range of frequencies.
Implementation Method 1
a converter including a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration
Data Source
AI summary
An electroacoustic transducer is provided and includes: a diaphragm having a pair of longitudinal split tubular surfaces arranged next to each other, a valley being formed between respective side portions of the pair of longitudinal split tubular surfaces; a converter including a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm such that the diaphragm is vibratable along the depth direction of the valley. A tubular portion is provided at an intermediate portion of the valley to couple the diaphragm and the voice coil to each other, and the tubular portion extends in the depth direction of the valley.