Microspeaker Inner Resonance Chamber Slim Design

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Solution Overview

Problem

Conventional microspeakers face challenges in achieving slim and compact designs while maintaining sound quality due to interference between forward and rearward sounds, and the inability to precisely control the resonance of rearward sounds, leading to degradation of low-frequency sounds and the presence of shrill sounds in the high-frequency range.

Innovation Solution

A microspeaker with an inner resonance chamber is designed, featuring a frame with open upper and lower portions, a magnetic unit, a vibration plate, and a circuit board, where a first through hole guides rearward sound to an inner chamber for resonance, and a second through hole discharges it, allowing precise control of the chamber's size and resonant frequency to block and damp rearward sound effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a back volume is installed in the enclosure to damp rearward sound, then low frequency sound characteristics are improved, but the microspeaker module becomes thicker

Engineering Contradiction:

Improvelow frequency sound characteristicsVSAvoidmicrospeaker module thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The resonance chamber is nested within the existing microspeaker structure, utilizing the space between the vibration plate and the enclosure. This allows the back volume to be integrated inside the microspeaker module rather than adding external thickness, resolving the contradiction between improving low frequency characteristics and maintaining compact dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of increasing the thickness (one dimension) to accommodate the back volume, the invention redistributes the space utilization within the existing footprint (two-dimensional plane). The resonance chamber is positioned in the vertical space already available within the microspeaker assembly, avoiding increase in overall module thickness while still providing adequate volume for low frequency enhancement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If rearward sound is completely blocked, then interference with forward sound is prevented, but air pressure rises causing amplitude reduction and frequency shift

Engineering Contradiction:

Improvesound qualityVSAvoidair pressure rise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The resonance chamber acts as an intermediary between the rearward sound source and the external environment. It provides a controlled space where rearward sound can be contained and managed, preventing direct interference with forward sound while avoiding complete blockage that would cause harmful air pressure buildup. The chamber volume is specifically designed to accommodate pressure variations without causing amplitude reduction or frequency shift.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the size of the back volume is increased to improve low frequency characteristics, then sound quality is enhanced, but the volumetric size of the microspeaker increases

Engineering Contradiction:

Improvelow frequency sound characteristicsVSAvoidmicrospeaker volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The microspeaker structure is segmented to create a dedicated resonance chamber portion within the existing assembly. By dividing the internal space and designating specific regions for the back volume, the invention achieves adequate volume for low frequency enhancement without requiring overall increase in microspeaker dimensions. The segmentation allows efficient space utilization within the existing footprint.

Inventive Principle:

Principle #1Segmentation

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 enables a slim and compact microspeaker that improves sound quality by preventing interference, shifting the resonant frequency from high to low frequencies, and eliminating shrill sounds, while allowing precise control of the inner resonance chamber to enhance low-frequency sound characteristics.

Implementation Method 1

installing a chamber with a specific volume within the microspeaker to allow the rearward sound to cause resonance

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

a first through hole penetrating the magnetic unit to guide the rearward sound generated at the vibration plate

Methodology Applied

Scientific EffectAcoustic wave propagation: Sound

Implementation Method 3

converts electrical energy into mechanical energy by positioning a voice coil in an air gap of the magnetic circuit, according to Fleming's left-hand rule, which states that when a coil of wire carrying an electric current is placed in a magnetic field, the coil is caused to move

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentUS8731223B2Microspeaker with inner resonance chamber

Publication Date: 2014.05.20 BUJEON

AI summary

Disclosed is a microspeaker with an inner resonance chamber, more particularly a microspeaker with an inner resonance chamber which improves quality of sound and enables slim and compact design of the microspeaker by blocking rearward sound generated at the rear side of the vibration plate to prevent interference of a rearward sound with a forward sound generated at the front side of a vibration plate and installing a chamber with a specific volume within the microspeaker to allow the rearward sound to cause resonance.