Asymmetric Phase Plug for Dome Speaker Sound Pressure
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Solution Overview
Problem
Speakers with dome-shaped diaphragms and phase plugs face issues with sound pressure variations and phase shifts due to differing sound wave reaching distances, leading to decreased sound pressure levels in specific frequency ranges, particularly in the high-frequency range.
Innovation Solution
A speaker design featuring a dome-shaped diaphragm with a phase plug having a front surface larger than its rear surface, a side surface with an inclined outward extension, and multiple ribs that direct sound waves towards the inner circumferential surface of a tubular member, ensuring consistent sound wave propagation and phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase plug is disposed in front of a dome-shaped diaphragm, then sound pressure decrease is suppressed and sound quality is improved, but sound pressure variations and phase shifts occur due to differing sound wave reaching distances
Solution Approach 1:
The phase plug is designed with an asymmetric structure where the front surface area is larger than the rear surface area. This asymmetric configuration creates an inclined surface that directs sound waves from the diaphragm toward the inner circumferential surface of the tubular member, compensating for phase shifts and sound pressure variations caused by different sound wave reaching distances.
Solution Approach 2:
The invention introduces a dimensional approach by creating an inclined surface on the phase plug that extends outward while extending forward. This three-dimensional surface configuration redirects sound waves along a specific path toward the tubular member's inner circumferential surface, adding a spatial dimension to sound wave management and achieving more uniform sound pressure distribution.
2Reliability
If the phase plug has a front surface larger than rear surface, then sound waves are directed toward inner circumferential surface, but device complexity increases
Solution Approach 1:
The phase plug is segmented into distinct functional surfaces: a front surface, a rear surface, and an inclined side surface. This segmentation allows each surface to perform its specific function - the front and rear surfaces define the plug's boundaries while the inclined side surface handles sound wave redirection, making the complex overall structure easier to design and manufacture through modular functional division.
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 design enhances sound quality by minimizing sound pressure dips in critical frequency ranges and improving sound extension, particularly in the high-frequency range, by maintaining consistent sound pressure levels and phase coherence.
Implementation Method 1
at least a part of the side surface of the phase plug has an inclined surface that extends outward while extending forward, faces an inner circumferential surface of the tubular member and a front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward an inner circumferential surface of the tubular member
Implementation Method 2
A phase of a sound wave generated from a part of the diaphragm facing the phase plug is matched with a phase of a sound wave generated from another part of the diaphragm. Accordingly, a decrease in sound pressure is suppressed
Data Source
AI summary
A speaker includes: a diaphragm having a dome shape; a tubular member having the diaphragm disposed inside, and having an inner diameter increasing toward a front; and a phase plug. The phase plug includes: a front surface, a rear surface facing a central portion on a front surface of the diaphragm at a constant interval in parallel, and a side surface connecting the front surface and the rear surface. A front surface of the phase plug is larger than a rear surface of the phase plug as viewed in a front-rear direction of a speaker. At least a part of a side surface of the phase plug has an inclined surface extending outward while extending forward, faces an inner circumferential surface of the tubular member and a front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward an inner circumferential surface of the tubular member.