Rectangular Micro Speaker Suspension for Balanced Vibration

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Solution Overview

Problem

Conventional micro speakers face issues with unbalanced vibration, increased weight, and crack formation in the conductive pattern due to the absence of a specialized suspension, which limits their application to high-power scenarios and results in decreased sound pressure.

Innovation Solution

A suspension structure with a rectangular shape and conductive pattern where land portions for lead wires are positioned on long sides, and protective films are strategically removed to reduce vertical vibration intensity and prevent cracks, ensuring balanced vibration and improved sound pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a suspension is added to ensure lightweight of diaphragm and balanced vibration, then vibration balance is improved, but weight of diaphragm increases leading to decreased sound pressure

Engineering Contradiction:

Improvevibration balanceVSAvoidweight of diaphragm

Core Design Contradiction:

Stability of the object's compositionVSWeight of moving object

Solution Approach 1:

The suspension is divided into multiple functional parts: an outer peripheral portion, an inner peripheral portion, and connection portions. This segmentation allows each part to be optimized independently - the connection portions are designed with specific geometries to minimize weight while providing necessary mechanical support and vibration balance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The suspension transitions from a conventional planar structure to a three-dimensional structure with varying thickness and立体 geometry. This dimensional change allows the suspension to provide structural support and vibration balance while minimizing material usage and weight.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If land portions are formed on connection portion of suspension, then lead wires can be connected, but cracks occur in conductive pattern due to surface tension in high power

Engineering Contradiction:

Improvelead wire connectionVSAvoidcrack resistance of conductive pattern

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The land portions are asymmetrically positioned on the connection portions, specifically located away from the high-stress regions. This asymmetric placement allows lead wire connection while avoiding areas prone to cracking under high power conditions.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The conductive pattern is designed with wider trace widths and increased spacing in regions susceptible to cracking. This preemptive design approach cushions against the development of cracks by reducing stress concentration before it can initiate failure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If conventional suspension structure is used, then manufacturing is simple, but unbalanced vibration occurs and lead wire breaks in high power

Engineering Contradiction:

Improvesuspension fabricationVSAvoidlead wire durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The suspension serves multiple functions simultaneously: it provides mechanical support for the diaphragm, ensures balanced vibration, positions lead wires correctly, and protects against cracking. This multi-functionality is achieved through an integrated design where the connection portions incorporate both structural and electrical functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Ease of operation

If suspension with conductive pattern is used to transmit electric signals, then lead wire connection is improved, but weight increases and sound pressure decreases

Engineering Contradiction:

Improveelectric signal transmissionVSAvoidweight of diaphragm

Core Design Contradiction:

Ease of operationVSWeight of moving object

Solution Approach 1:

The suspension incorporates thin film conductive patterns that provide electrical signal transmission capability while minimizing added weight. The conductive traces are designed as thin films integrated into the suspension structure rather than adding separate heavy components.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS9900703B2Suspension for high power micro speaker and high power micro speaker having the same

Publication Date: 2018.02.20 EM TECH CO LTD

AI summary

The present invention relates to a suspension structure for a high power micro speaker and, more particularly, to a shape of a suspension which ensures a lightweight of the suspension as well as high reliability and a conductive pattern which applies electric signals. The present invention provides a suspension for a high power micro speaker that includes an outer peripheral portion, a central portion and a connection portion, is provided with a conductive pattern, and is formed in a rectangular shape, wherein land portions for use in soldering or welding lead-in wires of a voice coil are formed on long connection portions disposed on long sides.