Shallow Profile Compression Driver Phasing Plug Design
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Solution Overview
Problem
Existing compression drivers with annular diaphragms face challenges in positioning the diaphragm relative to the phasing plug, leading to distortion, rub, and buzz due to nonlinear air compression, and require a compromise between mechanical breakup resonance and air resonance, while also having a redundant adapter housing that increases the driver's profile.
Innovation Solution
The design eliminates the redundant adapter housing, featuring a shallow profile compression driver with a phasing plug and horn that starts from the area of the phasing plug entrance, providing a gradual expansion of the air path's cross-sectional area and a small compression chamber volume, allowing for direct sound wave propagation and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the diaphragm is positioned close to the phasing plug to reduce compression chamber volume, then high frequency signal transmission is improved, but distortion increases due to nonlinear air compression
Solution Approach 1:
The patent changes the physical parameters of the compression chamber by reducing its volume through the shallow profile design, while simultaneously managing the air compression nonlinearity through optimized diaphragm positioning and horn loading to maintain signal fidelity
Solution Approach 2:
The patent transitions from a traditional deep compression chamber configuration to a shallow profile configuration, effectively changing the dimensional characteristics of the compression chamber to achieve better high frequency response while controlling distortion
2Speed
If the compression chamber volume is reduced to improve high frequency response, then the low-pass filter effect is reduced, but the risk of diaphragm collision with the phasing plug increases
Solution Approach 1:
The patent optimizes the compression chamber volume parameter to achieve a balance between high frequency response and mechanical clearance, using the shallow profile configuration to minimize volume while maintaining adequate diaphragm travel space
Solution Approach 2:
The patent employs a compliant diaphragm design that can dynamically adjust its position, allowing the diaphragm to move closer to the phasing plug during operation while maintaining safety margins through the compliant nature of the diaphragm material
3Length of moving object
If the adapter housing is eliminated to reduce driver profile depth, then device compactness is improved, but the complexity of integrating the horn directly to the phasing plug increases
Solution Approach 1:
The patent merges the adapter housing function directly into the horn assembly, eliminating the redundant intermediate component and creating a more integrated structure where the horn serves both as the acoustic loading element and the mechanical coupling element
Solution Approach 2:
The patent extracts and eliminates the redundant adapter housing from the traditional compression driver configuration, removing the unnecessary intermediate component that added depth without providing functional value
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 a shallower profile, improved high-frequency radiation, wider directivity response, and a smooth frequency response with extended frequency range, minimizing unwanted reflections and distortions.
Implementation Method 1
a compression chamber is defined between the diaphragm and the phasing plug
Implementation Method 2
The air paths of the phasing plug are essentially the beginning of the horn which is attached to the compression driver to control directivity
Implementation Method 3
The advantage of annular diaphragms is the smaller radial dimensions of the moving part of the diaphragm
Data Source
AI summary
A compression driver includes a phasing plug including a base portion having a first side and an opposed second side, the first side including a central hub portion extending outwardly from the first side, the base portion including one or more apertures that extend therethrough from the first side to the second side. A diaphragm is disposed adjacent the phasing plug second side, and a compression chamber defined between the diaphragm and the phasing plug. In one embodiment, a front plate is attached to the phasing plug first side, the front plate having a central aperture generally aligned with the hub portion and base portion apertures. A horn may be attached to the front plate or directly to the phasing plug first side.