Speaker Diaphragm Gradient Stress and Rough Surface

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Solution Overview

Problem

Existing speaker diaphragms face challenges in achieving optimal sound quality due to complex sound propagation, absorption, and reflection patterns, which are influenced by the material, manufacture, shape, and characteristics of the diaphragm.

Innovation Solution

A diaphragm made of homogeneous amorphous material with gradient stress distribution, specifically using silicon dioxide, is designed with varying thicknesses and surface features such as rough surfaces and coating layers to enhance sound quality and energy loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the diaphragm uses conventional materials and uniform thickness, then manufacturing is simpler, but sound quality and energy loss control are insufficient

Engineering Contradiction:

Improveenergy lossVSAvoiddiaphragm structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The diaphragm employs varying thickness across different regions (thinner at edges, thicker at center) and incorporates surface roughness modifications in specific areas to optimize energy dissipation. This local variation in geometric properties enhances energy loss control without requiring complex material compositions throughout the entire structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes physical parameters of the diaphragm including thickness distribution (from uniform to gradient), surface roughness (smooth to controlled roughness in specific regions), and geometric shape (flat to curved/bent sides). These parameter modifications improve energy loss characteristics while maintaining manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If the diaphragm surface is smooth, then manufacturing is easier, but surface acoustic wave reflection increases

Engineering Contradiction:

Improvesurface acoustic wave reflectionVSAvoidsurface processing complexity

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

The diaphragm surface is modified with controlled roughness in specific regions rather than uniformly across the entire surface. This localized surface treatment reduces surface acoustic wave reflection at critical areas while maintaining manufacturing simplicity in other regions.

Inventive Principle:

Principle #3Local quality

3Strength

If the diaphragm thickness is increased, then structural strength improves, but weight and sound propagation characteristics deteriorate

Engineering Contradiction:

Improvediaphragm strengthVSAvoiddiaphragm weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The diaphragm employs a gradient thickness design where the center region has greater thickness for strength and the edge regions have reduced thickness for weight optimization. This local variation in thickness maintains overall structural integrity while minimizing total weight and improving sound propagation characteristics.

Inventive Principle:

Principle #3Local quality

4Productivity

If the diaphragm has flat sides, then manufacturing is simpler, but sound radiation pattern is less optimized

Engineering Contradiction:

Improvesound radiation efficiencyVSAvoidshape complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The diaphragm incorporates curved or bent side regions instead of completely flat sides. This curvature modification optimizes the sound radiation pattern and acoustic performance while maintaining manufacturing simplicity through conventional forming processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 diaphragm achieves improved sound quality by controlling energy loss and vibration characteristics through gradient stress distribution and surface modifications, resulting in better sound propagation and reduced surface acoustic wave reflection.

Implementation Method 1

The part or all of the upper surface area or the lower surface area has a rough surface for reducing surface acoustic wave reflection

Methodology Applied

Scientific EffectSurface acoustic wave reflection reduction: Surface Acoustic Wave

Implementation Method 2

A coating layer is formed on part or all of the upper surface area, the lower surface area or the combination thereof for increasing the damping of the diaphragm

Methodology Applied

Scientific EffectDamping: Damping

Implementation Method 3

The homogeneous amorphous diaphragm includes stress distribution as a function of depth from the surface to the center of the diaphragm

Methodology Applied

Scientific EffectStress distribution: Stress Relaxation

Data Source

PatentUS20250133344A1Diaphragm for Speaker

Publication Date: 2025.04.24 GLASS ACOUSTIC INNOVATIONS CO LTD

AI summary

The present invention discloses a diaphragm for a speaker including a lower surface area, a central area formed on said lower surface area, an upper surface area formed on said central area. The upper surface area, the central area and the lower surface area includes homogeneous amorphous materials. The diaphragm includes internal stress changing with a depth from the surface to the center of the diaphragm.