Earbud Tip Double Sealing Structure for Noise Reduction
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Solution Overview
Problem
Existing ear caps for in-ear earphones are generally thin, allowing external noise to easily penetrate and enter the ear canal.
Innovation Solution
The ear cap incorporates a double sealing structure with a main body and a noise reduction portion, forming a noise reduction cavity that absorbs and attenuates external noise, preventing it from entering the ear canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ear cap is made thin, then the ease of manufacture and comfort are improved, but the noise reduction performance deteriorates
Solution Approach 1:
The noise reduction portion is nested within the accommodating space of the ear cap main body, creating a multi-layered structure where the noise reduction portion (with its own cavity) is contained within the larger ear cap structure, allowing enhanced noise reduction without significantly increasing external dimensions
Solution Approach 2:
The noise reduction portion extends in the sound outlet direction (depth dimension) rather than only in radial thickness, utilizing the accommodating space to create a three-dimensional noise reduction cavity that provides effective noise attenuation without requiring the ear cap to be thicker in all directions
2Object-affected harmful factors
If the ear cap thickness is increased, then the noise reduction performance is improved, but the device complexity increases
Solution Approach 1:
The noise reduction portion is integrated with the ear cap main body as a unified structure, where the noise reduction portion and main body work together as a combined noise reduction system, reducing the need for separate components and assembly steps
Solution Approach 2:
The noise reduction portion serves multiple functions: it creates a noise reduction cavity for sound attenuation, provides an additional sealing interface through its outer side wall, and utilizes the accommodating space efficiently, thereby achieving multiple objectives with a single structural element
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 enhanced thickness of the ear cap and the noise reduction cavity significantly improve noise reduction performance, effectively preventing external noise from entering the ear canal.
Implementation Method 1
the noise is gradually absorbed, twisted and attenuated by damping of the noise reduction cavity when entering the airtight noise reduction cavity
Data Source
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AI summary
Disclosed are an earphone and an ear cap applied to the earphone, in which the earphone has an earphone body, the earphone body has a sound outlet pipe, the sound outlet pipe has a sound channel, and an end of the sound outlet pipe is provided with a sound outlet hole in communication with the sound channel; and the ear cap includes a main body and a noise reduction portion, in which the main body is provided with an accommodating space and a sound outlet channel in communication with the accommodating space, the sound outlet channel is configured to communicate with the sound outlet hole of the sound outlet pipe; and at least part of the noise reduction portion is located in the accommodating space, an outer diameter of the noise reduction portion is reduced in a sound outlet direction, and a noise reduction cavity is formed between an outer side wall of the noise reduction portion and an inner side wall of the main body. The ear cap adopts a double sealing structure of the main body and the noise reduction portion, which can greatly improve a thickness of the ear cap, so that the ear cap has good noise reduction performance and can effectively prevent the external noise from penetrating the ear cap and entering the ear canal. (Fig. 2)