Earphone Baffle Venting for Acoustic Quality
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Solution Overview
Problem
Conventional earphones face challenges in achieving good tone quality due to the difficulty in enlarging the housing diameter, which restricts the size of the speaker unit and compromises sound quality when a communicating passage is provided on the divisional wall.
Innovation Solution
The design includes a baffle within the housing that supports the speaker unit, with vent holes allowing communication between different spaces, enabling a larger external shape without miniaturizing the speaker unit, and a baffle with a base portion and supporting arm portions that protrude to accommodate the speaker unit's side surface, facilitating a communicating passage without increasing the housing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a communicating passage is provided on the divisional wall to enable front and rear space communication, then acoustic quality is improved, but the housing diameter must be enlarged which increases the overall size
Solution Approach 1:
The patent transitions from providing communicating passages on the divisional wall (horizontal dimension) to providing them on the bottom wall between the speaker unit and housing bottom surface (vertical dimension). This dimensional change allows acoustic communication without increasing housing diameter, resolving the contradiction between acoustic quality and compact size.
2Area of stationary object
If the speaker unit diameter is reduced to fit within a compact housing, then housing size is minimized, but tone quality deteriorates
Solution Approach 1:
By moving the communicating passage from the divisional wall to the bottom wall area between the speaker unit and housing bottom surface, the patent enables use of larger diameter speaker units without increasing housing diameter. This resolves the contradiction between compact housing size and good tone quality.
3Reliability
If the housing diameter is enlarged to accommodate a larger speaker unit, then tone quality is improved, but the earphone becomes less suitable for fitting into the concha
Solution Approach 1:
The patent utilizes the vertical space between the speaker unit and housing bottom surface to provide communicating passages, rather than expanding the horizontal housing diameter. This allows larger speaker units to be accommodated while maintaining a compact overall size suitable for concha fitting, resolving the contradiction between tone quality and wearability.
Data Source
AI summary
An earphone includes a speaker unit, a housing that receives the speaker unit therein, and a baffle that is arranged within the housing and supports an opposite surface of the speaker unit, which is opposite to a sound emission surface of the speaker unit, to define a first space between the opposite surface and the baffle. The baffle includes a vent hole through which the first space communicates with a second space that is opposite to the first space with respect to the baffle. A fourth space through which the first space communicates with a third space on a side of the sound emission surface of the speaker unit is defined between a side surface of the speaker unit and an inner surface of the housing.