Acoustic Vent Port Layout for Lower Sound Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustic devices face challenges in optimizing the design of pressure relief holes to enhance sound output performance while minimizing sound leakage and avoiding acoustic short-circuits, particularly in the near field, which can affect user listening experience.
Innovation Solution
The design of pressure relief holes in acoustic devices includes a configuration where the portion closer to the sound outlet hole is narrower and the portion farther away is wider, ensuring sufficient air permeability and minimizing acoustic short-circuits by maintaining a significant distance between the holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief hole is designed with larger area to improve air permeability, then sound leakage increases and acoustic short-circuit occurs
Solution Approach 1:
The pressure relief hole employs non-uniform cross-sectional area along its length, with the first section having a smaller area than the second section. This local variation in geometry optimizes air flow characteristics while preventing sound leakage and acoustic short-circuiting, resolving the contradiction between air permeability and sound isolation.
2Reliability
If the pressure relief hole is positioned closer to the sound outlet hole to improve acoustic coupling, then acoustic short-circuit increases
Solution Approach 1:
The patent varies the cross-sectional area parameter along the length of the pressure relief hole, creating a gradient structure where the area increases from the first section to the second section. This parameter change optimizes the balance between acoustic coupling and preventing short-circuit while maintaining effective air permeability.
3Ease of manufacture
If the pressure relief hole has uniform cross-section to simplify manufacturing, then air permeability and sound leakage control are suboptimal
Solution Approach 1:
The pressure relief hole is divided into multiple sections (first section and second section) with different cross-sectional areas. This segmentation allows each section to be optimized for specific functions while maintaining manufacturability, achieving both ease of manufacture and superior acoustic performance.
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 improves sound output performance by reducing sound leakage and preventing acoustic short-circuits, enhancing user comfort and listening experience.
Implementation Method 1
The diaphragm is configured to generate a sound through vibration
Implementation Method 2
The sound outlet hole is configured to guide a sound generated at a front side of the diaphragm out of the housing. The one or more pressure relief holes are configured to guide a sound generated at a rear side of the diaphragm out of the housing
Data Source
AI summary
The present disclosure relates to an acoustic device, including a sound output unit and a suspension structure. In a wearing state, a sound outlet hole is provided on an inner side surface of a housing of the sound output unit, and one or more pressure relief holes are provided on other side surfaces. On a reference plane parallel or tangent to a side surface where an effective vent port of each of the one or more pressure relief hole is located, the effective vent port o has a first projection, and the sound outlet hole has a second projection. The first projection defines a plurality of first feature line segments that are perpendicular to the inner side surface, two endpoints of each of the plurality of first feature line segments are located on a contour of the first projection, and the plurality of first feature line segments are parallel to each other. For each of the plurality of first feature line segments, an endpoint of the two endpoints that is farther from the second projection is defined as a reference point. The plurality of reference points of the plurality of first feature line segments include a first reference point and a second reference point, a distance from the first reference point to the second projection is less than a distance from the second reference point to the second projection, the plurality of first feature line segments include a first sub-line segment and a second sub-line segment, the first sub-line segment passes through the first reference point, the second sub-line segment passes through the second reference point, the first sub-line segment has a first length, the second sub-line segment has a second length, and the first length is less than the second length.