Earphone Pressure Equalizing Means with Dual Air Paths
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Solution Overview
Problem
Conventional canal-type earphones face challenges in pressure equalization due to blocked ventilation grooves or holes, leading to increased pressure differences that can damage eardrums, and existing solutions complicate the formation of air paths with limited widths and lengths, making precise air discharge control difficult.
Innovation Solution
An earphone design with a pressure equalizing means featuring a speaker unit disposed inside the earphone housing, where sound waves are emitted through a first air path on one side and air is discharged through a second air path on the top surface, increasing the length and width of the air paths and simplifying the structure for smooth airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation grooves are formed on earpieces or ventilation holes are formed in sound tubes, then air can be discharged to prevent pressure difference, but the ventilation paths may be blocked by earpieces when inserted into external ear canals
Solution Approach 1:
The invention redirects the air discharge path from a straight linear path (through earpiece/sound tube) to a three-dimensional curved path that exits at the rear of the speaker unit. This spatial repositioning in another dimension avoids the blockage issue while maintaining pressure equalization function.
2Device complexity
If conventional ventilation paths are used, then air discharge is simple, but the air path length is short and it is difficult to precisely control the amount of air discharged
Solution Approach 1:
The invention introduces a flexible membrane that can dynamically adjust the air path cross-sectional area based on pressure differential. As pressure builds up, the membrane deforms to increase the discharge area, enabling automatic adaptive control of air flow without complex mechanical components.
Solution Approach 2:
The invention changes the physical state of the air path from a rigid fixed-geometry channel to a flexible variable-geometry channel. The membrane's deformation under pressure changes the flow parameters (area, resistance) in real-time, enabling precise control of air discharge quantity.
3Reliability
If through grooves are formed in gasket and earphone housing to create side air path and rear air path, then pressure equalization is achieved, but the work of forming through grooves is complicated and air does not flow smoothly due to limited widths
Solution Approach 1:
The invention extracts the air discharge function from the rigid housing structure (where through grooves would be needed) and relocates it to the flexible membrane component. This separates the structural support function from the flow control function, simplifying manufacturing while improving flow characteristics.
Solution Approach 2:
The invention uses a flexible membrane that can be manufactured with porous or perforated structure, allowing air to flow smoothly through multiple small openings rather than requiring large through grooves. This enables better flow characteristics while simplifying the housing structure.
4Object-generated harmful factors
If earpieces completely block external ear canals to provide sound insulation, then sound insulation property is improved, but pressure difference occurs that can damage eardrums
Solution Approach 1:
The invention introduces a flexible membrane as an intermediary component between the sealed ear canal environment and the external atmosphere. This mediator allows controlled pressure equalization while maintaining the acoustic seal, resolving the contradiction between sound insulation and pressure management.
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 design effectively prevents pressure buildup in the ear canal, ensuring proper sound transmission and protecting the eardrums by allowing precise control over air discharge, thereby simplifying the pressure equalization process and enhancing user safety.
Implementation Method 1
a pressure equalizing means (40) configured to discharge air inside the external ear canal out of the speaker unit (5)
Data Source
AI summary
The present invention relates to an earphone equipped with a pressure equalizing means, and more specifically to an earphone equipped with a pressure equalizing means, in which a speaker unit is disposed inside an earphone housing in a longitudinal direction and a first air path is formed to discharge sound waves, generated by the diaphragm of the speaker unit, to the external ear canal through one side of the speaker unit. When air inside the external ear canal is discharged out of the speaker unit, air is discharged into the vibration space of the speaker unit by using the first air path, and is then discharged out of the speaker unit through a second air path formed in the other side of the top surface of the speaker unit.