Loudspeaker Center-of-Gravity Mounting for Reduced Sound Distortion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional speaker devices suffer from unbalanced weight distribution, leading to vibration transmission from the loudspeaker to the cabinet, causing sound distortion during reproduction.

Innovation Solution

The speaker device is designed with the field portion positioned rearwardly of the diaphragm, and the loudspeaker is mounted to the cabinet at its center of gravity, using a mounting member that includes the top plate, ensuring balanced weight distribution and reducing vibration transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the field portion is disposed nearer to the sound emitting side than the diaphragm to adjust weight balance, then the center of gravity position is improved, but sound distortion occurs due to field portion interference

Engineering Contradiction:

Improveweight balanceVSAvoidsound distortion

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent positions the field portion in the depth dimension (rearwardly of the diaphragm) rather than laterally adjacent to it, changing the spatial arrangement from a two-dimensional plane to a three-dimensional configuration that eliminates sound interference while maintaining weight balance

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If the frame is fixed to the cabinet at the periphery of the sound emitting side, then the mounting structure is simplified, but vibration transmits to the cabinet causing sound distortion

Engineering Contradiction:

Improvemounting structureVSAvoidvibration transmission

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent uses the center of gravity as a counterbalance point for mounting, positioning the mounting plane at the center of gravity location to create rotational equilibrium that prevents vibration transmission to the cabinet while maintaining structural simplicity

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Ease of manufacture

If the loudspeaker is mounted at a plane not including the center of gravity, then the mounting location is easier to implement, but the weight balance is poor leading to vibration

Engineering Contradiction:

Improvemounting locationVSAvoidweight balance

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent creates a gravitational equipotential condition by positioning the mounting plane at the center of gravity, where the gravitational forces are balanced in all directions, eliminating rotational moments and achieving stable weight balance

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentEP3429220B1Speaker device

Publication Date: 2025.07.09 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

Figure 1
Figure 2
Figure 3

AI summary

A speaker device that is provided suppresses distortion in reproduced sound, thus being capable of reproducing clear sound. This speaker device includes: a loudspeaker including a diaphragm and a field portion disposed rearwardly of the diaphragm; and a cabinet accommodating the field portion. The loudspeaker also includes a mounting member with which the loudspeaker is mounted to the cabinet, and a mounting plane of the mounting member includes a center of gravity of the loudspeaker.