Receiver Unit Pressure Equilibrium Structure for Earphone Low Frequency

Solution Overview

Problem

Canal-type earphones experience a decrease in sound pressure in the low frequency range due to incomplete sealing, which also causes discomfort from pressure differences between the ear canal and ambient air.

Innovation Solution

A receiver unit with a pressure equilibrium structure and a compensation structure for low frequencies, featuring a ventilation recess on the upper casing and a duct in the lower casing, along with an acoustic mesh to prevent complete sealing and enhance sound pressure in the low frequency range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the ear canal is completely sealed to improve sound insulation and bass response, then sound pressure in low frequency range increases, but pressure difference between ear canal and ambient air causes discomfort and deafening

Engineering Contradiction:

Improvesound pressure in low frequency rangeVSAvoidpressure difference discomfort

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The air passage is segmented into multiple paths: a first air passage for pressure equilibrium and a second air passage for sound transmission. This segmentation allows the earphone to simultaneously achieve pressure relief and maintain sound quality by directing different functions through separate channels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A pressure equilibrium hole is introduced as an intermediary structure that allows air to pass through the gasket. This intermediary element enables pressure equalization between the ear canal and ambient air without compromising the sealing required for sound insulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If air passages are provided to relieve pressure difference, then pressure discomfort is reduced, but sound pressure in low frequency range decreases

Engineering Contradiction:

Improvepressure difference discomfortVSAvoidsound pressure in low frequency range

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

Different parts of the gasket have different properties: most of the gasket maintains sealing for sound insulation, while a specific local region (where the pressure equilibrium hole is located) allows air passage. This local quality differentiation enables simultaneous pressure relief and sound pressure maintenance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The air passage is segmented into multiple paths: a first air passage for pressure equilibrium and a second air passage for sound transmission. This segmentation allows the earphone to simultaneously achieve pressure relief and maintain sound quality by directing different functions through separate channels.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If the ear canal is not completely sealed to prevent pressure difference, then pressure discomfort is reduced, but sound insulation and low frequency response deteriorate

Engineering Contradiction:

Improvepressure difference discomfortVSAvoidsound insulation performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

A pressure equilibrium hole is introduced as an intermediary structure that allows air to pass through the gasket. This intermediary element enables pressure equalization between the ear canal and ambient air without compromising the sealing required for sound insulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Different parts of the gasket have different properties: most of the gasket maintains sealing for sound insulation, while a specific local region (where the pressure equilibrium hole is located) allows air passage. This local quality differentiation enables simultaneous pressure relief and sound pressure maintenance.

Inventive Principle:

Principle #3Local quality

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 solution effectively balances pressure inside and outside the ear canal, reducing discomfort and maintaining sound pressure in the low frequency range by allowing controlled air flow and resonance in the duct path.

Implementation Method 1

a ventilation recess is provided on an outer surface of the upper casing to allow air to flow between an upper space of the upper casing and a lower space of the lower casing

Methodology Applied

Scientific EffectAir flow:

Implementation Method 2

at least one acoustic mesh located in a duct path and compensating for a reduction in a low frequency

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11368784B2Receiver unit having pressure equilibrium structure and compensation structure for low frequency

Publication Date: 2022.06.21 EM TECH CO LTD

AI summary

Disclosed is a receiver unit having a pressure equilibrium structure and a compensation structure for a low frequency, including a receiver including a frame, a magnetic circuit, a voice coil, and a diaphragm, an upper casing covering an upper portion and a side surface of the receiver and having a sound insulation hole, and a lower casing attached to a lower surface of the receiver and coupled to the upper casing, wherein a ventilation recess is provided on an outer surface of the upper casing to allow air to flow between an upper space of the upper casing and a lower space of the lower casing, the receiver includes a back hole, and the lower casing includes a duct connecting the back hole and the lower space of the lower casing.