In-Ear Earphone Attenuation Guide for Noise Interference
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Solution Overview
Problem
Current in-ear headphones suffer from external sound interference due to a short path between openings and the cavity, which affects the user's experience.
Innovation Solution
The design incorporates an attenuation guide with multiple channels that guide external sound through a winding path, reducing interference by attenuating sound energy before it reaches the user's eardrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If openings are provided on the outer casing to release internal pressure in the cavity, then the internal pressure is reduced, but external sound is easily transmitted to the eardrum through the openings
Solution Approach 1:
The single opening is segmented into multiple attenuation channels (first attenuation channel, second attenuation channel, third attenuation channel) with different path lengths and configurations. Each channel provides a separate sound transmission path with varying attenuation characteristics, collectively achieving both pressure equalization and sound isolation.
Solution Approach 2:
The attenuation channels are designed with curved or winding paths instead of straight lines. The first attenuation channel extends along a first axis, the second along a second axis, and the third along a third axis, creating longer, more complex sound transmission paths that increase attenuation of external sound while still allowing pressure equalization.
2Device complexity
If the path between openings and cavity is shortened for simple structure, then manufacturing is easier, but external sound interference increases
Solution Approach 1:
The sound attenuation problem is solved by transitioning from a one-dimensional straight path to multi-dimensional winding paths. The attenuation channels extend along different axes (first axis, second axis, third axis) and may include curved sections, utilizing spatial dimensions to increase path length without proportionally increasing structural complexity.
Solution Approach 2:
Multiple attenuation channels are nested within the earphone casing structure, with channels of different lengths and configurations arranged to optimize space utilization. The channels are integrated into the existing casing and diaphragm assembly, achieving complex sound attenuation functionality within a compact form factor.
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 effectively attenuates external sound energy, enhancing the user experience by minimizing external noise interference during headphone use.
Implementation Method 1
An external sound enters through the first through hole of the casing and enters the rear cavity through the first attenuation channel of the attenuation guide, is then guided to the front cavity through the second attenuation channel of the attenuation guide, and is guided out through the sound outlet
Data Source
AI summary
An in-ear earphone, including a casing, a speaker, and an attenuation guide, is provided. The casing includes a sound outlet and a first through hole. An inside of the casing has a first accommodating space. The speaker is disposed in the first accommodating space. The casing defines a front cavity and a rear cavity by the speaker. The attenuation guide is formed in the casing and includes at least a first attenuation channel and a second attenuation channel. The first attenuation channel has a first inlet and a first outlet. The first inlet is connected to the first through hole. The second attenuation channel has a second inlet and a second outlet. The second inlet, the first outlet, and the rear cavity are acoustically connected, and the second outlet is connected to the front cavity.