Earphone Pressure Relief Hole Layout for Sweat-Resistant Acoustics
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Solution Overview
Problem
Earphones exhibit inferior acoustic performance during physical activities due to sweat accumulation at the pressure relief hole, which increases resistance and degrades sound quality.
Innovation Solution
The acoustic output device incorporates a second pressure relief hole in fluid communication with the second acoustic cavity to compensate for the effects of sweat on the first pressure relief hole, reducing resistance and far-field sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure relief hole is provided, then the structure is simple, but the acoustic performance degrades when the hole is covered by sweat during physical activity
Solution Approach 1:
The single pressure relief hole is segmented into multiple pressure relief holes (first pressure relief hole and second pressure relief hole). This segmentation ensures that if one hole becomes blocked by sweat, the other holes can still function to relieve pressure, thereby maintaining acoustic performance during physical activity without significantly increasing structural complexity.
2Reliability
If the pressure relief hole is positioned for optimal pressure relief, then acoustic performance is improved, but the hole becomes more susceptible to being covered by sweat during activities
Solution Approach 1:
Multiple pressure relief holes are distributed at different positions on the housing. This spatial segmentation reduces the probability that all holes will be simultaneously covered by sweat, as sweat tends to accumulate in specific areas. At least one hole remains accessible to maintain pressure relief function.
Solution Approach 2:
Different pressure relief holes are positioned in locations with different susceptibility to sweat coverage. Some holes are placed in areas more prone to sweat accumulation while others are positioned in drier areas, creating local quality variations that ensure overall system reliability.
3Reliability
If multiple pressure relief holes are provided to compensate for sweat coverage, then acoustic performance during activities is maintained, but the device complexity increases
Solution Approach 1:
The pressure relief function is segmented across multiple holes, allowing the system to maintain reliability without requiring complex active control mechanisms. The segmentation approach is simple in implementation while effective in preventing sweat-related performance degradation.
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
The second pressure relief hole maintains acoustic performance by allowing air to enter and exit the acoustic cavity, minimizing the impact of sweat and other obstructions on the diaphragm's vibration, thereby enhancing sound quality during activities.
Implementation Method 1
the first pressure relief hole and the second pressure relief hole are in fluid communication with the second acoustic cavity
Implementation Method 2
The air conduction driver is disposed within the housing, the housing includes a first acoustic cavity and a second acoustic cavity, the first acoustic cavity and the second acoustic cavity are located on two sides of a diaphragm of the air conduction driver
Data Source
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AI summary
The present disclosure relates to an acoustic output device, and in particular, to the technical field of electronic devices. A housing (10) is provided with a sound outlet hole (103), a first pressure relief hole (104), and a second pressure relief hole (105). The sound outlet hole (103) is in communication with a first acoustic cavity (201), and the first pressure relief hole (104) and the second pressure relief hole (105) are in fluid communication with a second acoustic cavity (202). The housing (10) defines a first direction, a second direction, and a third direction that are orthogonal to each other. The housing (10) includes a first housing wall (1101) and a second housing wall (1102) arranged at intervals in the first direction, and the housing further includes a third housing wall (1103) connecting the first housing wall (1101) and the second housing wall (1102). The first pressure relief hole (104) is disposed on the third housing wall (1103), and the second pressure relief hole (105) is disposed on the second housing wall (1102). In a wearing state, the first housing wall (1101) faces toward a head of a user, the second housing wall (1102) is arranged at a side of the first housing wall (1101) opposite to the head of the user, and the third housing wall (1103) is located on a side of the housing (10) opposite to a crown of the head of the user in the third direction. In certain scenarios, the present disclosure can, at least during exercise, improve the deterioration of acoustic performance caused by the first pressure relief hole (104) being covered by the user's sweat.