Compound Membrane Anti-Fatigue Design

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Solution Overview

Problem

Compound membranes used in speakers and microphones, comprising a glue layer and additional Polyarylate layers, suffer from inadequate anti-fatigue performance and short lifetime.

Innovation Solution

A compound membrane structure featuring a central Polyethylene Terephthalate (PET) layer sandwiched between upper and lower layers made of Polyetherimide (PEI), Polyethylene Naphthalate (PEN), Polyetheretherketone (PEEK), or Polyphenylsulfide (PPS) with acrylic glue layers, enhancing the multi-layer structure for improved durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a compound membrane is made with a glue layer and additional Polyarylate layers, then the membrane structure is formed, but the anti-fatigue performance is insufficient and the lifetime is short

Engineering Contradiction:

Improveanti-fatigue performanceVSAvoidlifetime

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies composite materials by combining PET, PEN, PEEK, or PPS layers with acrylic glue layers to create a multi-layer compound membrane structure. This composite structure leverages the complementary properties of different materials to achieve both structural integrity and enhanced anti-fatigue performance, directly resolving the contradiction between forming a functional membrane structure and achieving sufficient durability and lifetime.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If additional Polyarylate layers are used in the compound membrane, then the membrane structure is completed, but the durability is insufficient

Engineering Contradiction:

Improvemembrane structure formationVSAvoiddurability

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent replaces单一的Polyarylate material with a composite structure of PET, PEN, PEEK, or PPS layers combined with acrylic glue. This composite approach maintains ease of manufacture through layer-by-layer assembly while significantly improving durability by selecting materials with superior mechanical properties and fatigue resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The membrane is segmented into multiple functional layers (PET/PEN/PEEK/PPS layers and acrylic glue layers) rather than using a single homogeneous material. This segmentation allows each layer to contribute specific properties, with the polymer layers providing structural strength and the acrylic glue providing adhesion, thereby improving overall durability while maintaining manufacturability.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8141676B2Compound membrane and acoustic device using same

Publication Date: 2012.03.27 AAC TECHNOLOGIES PTE LTD

AI summary

The present invention provides a compound membrane and an acoustic device including such a compound membrane. The compound membrane includes a central layer, a first glue layer attached to one side of the central layer, a second glue layer attached to another side of the central layer, an upper layer provided on the first glue layer, and a lower layer provided beneath the second glue layer. The anti-fatigue performance of the compound membrane is desirable.