Conductive Lower Diaphragm Speaker Electrical Connection

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Solution Overview

Problem

Existing speakers face challenges with the use of flexible printed circuits (FPCs) that require significant internal space, leading to reliability issues and potential interference with the diaphragm, due to their short arm length and limited space within the speaker.

Innovation Solution

The implementation of a conductive lower diaphragm with inner and outer connecting portions and a metal layer buried within a structural layer, allowing electrical connection between the voice coil and external circuit without the need for FPCs, thereby eliminating space constraints and reducing material costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a flexible printed circuit (FPC) is used to electrically connect the voice coil to the external circuit, then electrical connectivity is achieved, but the internal space of the speaker is occupied and the reliability is reduced due to short arm length and potential fracture

Engineering Contradiction:

Improvereliability of electrical connectionVSAvoidinternal space of speaker

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent combines the electrical connection function with the lower diaphragm structure by making the lower diaphragm itself conductive through a metal layer. This merging eliminates the need for a separate FPC component, thereby saving internal space while maintaining reliable electrical connectivity between the voice coil and external circuit.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The lower diaphragm is designed to serve multiple functions: it provides structural support for the voice coil, enables electrical connectivity through its conductive metal layer, and maintains acoustic performance. This multi-functionality replaces the need for separate FPC components, optimizing space utilization while ensuring reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Volume of stationary object

If a flexible printed circuit (FPC) with short arm length is used, then space is saved, but the reliability is reduced and fracture risk increases

Engineering Contradiction:

Improveinternal space of speakerVSAvoidreliability of FPC

Core Design Contradiction:

Volume of stationary objectVSReliability

Solution Approach 1:

The electrical connection function is merged into the lower diaphragm structure itself through the metal layer. This eliminates the need for a separate FPC with short arms, thereby maintaining space efficiency while significantly improving reliability by using a more robust integrated structure that is less prone to fracture.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The lower diaphragm is constructed as a composite structure with a structural layer and a metal layer. This composite material approach provides both the mechanical strength needed for reliability and the electrical conductivity needed for connection, eliminating the weaknesses of using a thin FPC alone.

Inventive Principle:

Principle #40Composite materials

3Volume of stationary object

If insufficient internal space is available, then the speaker design is compact, but interference between the FPC and the lower diaphragm occurs

Engineering Contradiction:

Improveinternal space of speakerVSAvoidinterference between FPC and lower diaphragm

Core Design Contradiction:

Volume of stationary objectVSObject-affected harmful factors

Solution Approach 1:

By merging the electrical connection function into the lower diaphragm itself through the metal layer, the patent eliminates the need for a separate FPC component. This removes the source of potential interference between FPC and lower diaphragm, allowing compact speaker design without harmful interactions.

Inventive Principle:

Principle #5Merging (Combining)

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 solution ensures reliable electrical connectivity, avoids the risk of FPC fracture, and prevents interference between the diaphragm and FPC, resulting in improved acoustic performance and stability by eliminating the need for FPCs and optimizing internal speaker space.

Implementation Method 1

the voice coil is electrically connected to the metal layer through the first recess, and the metal layer is electrically connected to an external circuit through the second recess

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

The voice coil is inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11589166B1Speaker

Publication Date: 2023.02.21 AAC MICROTECH (CHANGZHOU) CO LTD

AI summary

Provided is a speaker, including: a frame, a vibration unit including a diaphragm, and a voice coil; a magnetic circuit unit including a yoke and a magnet, the magnetic circuit unit being provided with a magnetic gap; and a lower diaphragm. The voice coil is inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound; the lower diaphragm includes an inner connecting portion, an outer connecting portion, and an intermediate portion; the lower diaphragm includes a structural layer and a metal layer; the inner connecting portion includes a first recess, and the outer connecting portion includes a second recess; and the voice coil is electrically connected to the metal layer through the first recess, and the metal layer is electrically connected to an external circuit through the second recess. With this structure, internal space of the speaker is saved, reducing material cost and improving reliability.