Rectangular Micro Speaker Suspension with Conductive Pattern

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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 ability to handle high power and maintain sound pressure.

Innovation Solution

A suspension structure with a conductive pattern is designed, where lead wires are drawn out from opposite diagonal sides of a rectangular voice coil, and land portions for soldering or welding are positioned symmetrically on longer connection portions to prevent cracks and ensure balanced vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a suspension is provided with a conductive pattern for transmitting electric signals, then the micro speaker can handle high power, but the weight of the diaphragm increases leading to decreased sound pressure

Engineering Contradiction:

Improvepower handling capabilityVSAvoiddiaphragm weight

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The suspension is designed as an extremely thin flexible structure that provides the necessary mechanical support and electrical conductivity while minimizing added mass to the diaphragm assembly

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The suspension combines flexible structural material with conductive material in a composite design, achieving both mechanical support and electrical signal transmission functions in a single lightweight component

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If land portions for soldering or bonding lead wires are formed on the connection portion disposed on the short side, then the lead wires can be connected to the voice coil, but significant surface tension occurs causing cracks in the conductive pattern

Engineering Contradiction:

Improvelead wire connectionVSAvoidconductive pattern integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The suspension is designed with asymmetric placement of land portions on the long side rather than the short side, creating unequal stress distribution that prevents concentration of surface tension and eliminates crack formation in the conductive pattern

Inventive Principle:

Principle #4Asymmetry

3Weight of moving object

If a conventional micro speaker does not use a special suspension, then the diaphragm can be lightweight, but unbalanced vibration is generated

Engineering Contradiction:

Improvediaphragm weightVSAvoidvibration balance

Core Design Contradiction:

Weight of moving objectVSStability of the object's composition

Solution Approach 1:

The suspension serves multiple functions simultaneously: it provides mechanical support for balanced vibration, maintains diaphragm positioning, and transmits electrical signals through the integrated conductive pattern, eliminating the need for separate components

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP2701402B1Suspension for high power micro speaker, and high power micro speaker having the same

Publication Date: 2019.11.13 EM TECH CO LTD

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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.