Voice Coil Bobbin Protrusions for Heat and Adhesive Strength

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Solution Overview

Problem

Existing voice coils in speaker devices face issues with reduced adhesive strength and heat dissipation due to slits on the bobbin, leading to potential mechanical weakness and heat-related failures.

Innovation Solution

A voice coil design featuring a bobbin with protrusions on its outer surface to enhance adhesive strength and heat dissipation, using materials like aluminum, polyimide film, or glass fiber composites, and forming gaps between the coil and the bobbin to improve durability and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If slits are disposed in the bobbin to improve heat dissipation, then heat dissipation effect is improved, but contact area between bobbin and electric wire is reduced causing less adhesive strength

Engineering Contradiction:

Improveheat dissipationVSAvoidadhesive strength

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

Instead of creating slits in the bobbin to improve heat dissipation, the invention inverts the approach by adding protrusions to the bobbin surface. These protrusions increase the contact area with the electric wire, thereby improving adhesive strength while maintaining heat dissipation capability through the protrusion structures themselves.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The protrusions are formed at specific locations on the bobbin surface where contact with the electric wire occurs. This local modification concentrates the heat dissipation function at the protrusion tips while maintaining strong adhesive contact at the same locations, resolving the contradiction between heat dissipation and adhesive strength.

Inventive Principle:

Principle #3Local quality

2Temperature

If slits are disposed in the bobbin to dissipate heat, then heat dissipation is improved, but mechanical strength and durability are reduced

Engineering Contradiction:

Improveheat dissipationVSAvoidmechanical strength

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The invention inverts the conventional approach by replacing slits with protrusions on the bobbin surface. This inversion maintains the heat dissipation function while significantly improving mechanical strength and durability, as protrusions provide structural reinforcement rather than weakening the bobbin like slits would.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The bobbin is constructed using composite materials that can accommodate the protrusion structures while maintaining overall mechanical integrity. The composite structure allows the protrusions to serve dual purposes: heat dissipation pathways and mechanical reinforcement elements.

Inventive Principle:

Principle #40Composite materials

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

The protrusions maintain effective heat dissipation and adhesive strength, preventing slippage and increasing the mechanical durability of the voice coil, allowing operation up to higher temperatures without wire release.

Implementation Method 1

a plurality of protrusions formed over an outer peripheral surface of the bobbin

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

maintain an effect to dissipate heat

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS20250310696A1Voice coil and speaker device using the same

Publication Date: 2025.10.02 GOTO DENISH CO LTD

AI summary

Provided is a technology that maintains an effect to dissipate heat from a voice coil and achieves higher soundness.A voice coil 20 includes a bobbin 1 formed approximately cylindrically, and a coil 3 wound around the bobbin 1, and a plurality of protrusions 2 formed on an outer peripheral surface of the bobbin 1. To the outer peripheral surface of the bobbin 1, conductive foil 4 having a projected part and insulating paper 5 having a projected part are attached. The voice coil 20 is used for a speaker device.